Merge pull request 'docs(android): add Android app design plan' (#6) from docs/android-app-plan into main

Reviewed-on: #6
Reviewed-by: Colby Whitlock <whitlocktech@gmail.com>

android/PLAN.md

@@ -0,0 +1,451 @@
+# Android App — Plan
+
+Status: **planning only, no code yet.** This document is the design contract for the
+`RunicGateway/Android-app` repo. It is written before implementation so the API changes it
+depends on can be landed in `website/` and `docs/` first. When we start coding, the authoritative
+API reference is the committed OpenAPI spec at
+`website/server/swagger/swagger-output.json` (regenerated via `npm run swagger`).
+
+The workspace already holds `website/`, `link/`, `servuo-plugins/`, and `docs/`. `android-app/` is
+the fifth repo. It is **purely an API client of the website backend** — it never talks to the
+`link/` sidecar or the shard directly, and it ships none of the shard/sidecar wiring.
+
+---
+
+## 1. Purpose & scope
+
+A native Android client for a Runic Gateway shard's public site + player self-service. It surfaces
+the same content and player features as `website/client`, minus every administrative/management
+console. It is a **read + self-service** app, not an operator tool.
+
+### In scope
+- **Public content** (no auth): news / Five-on-Friday / newsletter / screenshots, wiki, CMS pages,
+  site status & maintenance page, contact form.
+- **Public shard widgets** (no auth): shard status, online staff, live event feed, economy series,
+  champion spawns, guilds, governors, houses/IDOC, presence — including the live **SSE** stream.
+- **Account & auth** (bearer token): native **username/password login (with TOTP 2FA)**, logout,
+  refresh; account self-service (change username/password, TOTP enroll/disable, list/unlink SSO
+  identities). Registration, invite acceptance, password reset, and SSO are **website-handled** — the
+  app hands off to the website's pages for those (§4.2), not native screens.
+- **Player's own shard/game data** (bearer token): link a game account via a `[link` one-time code,
+  hybrid game-account signup, list linked accounts, own character roster, character sheet, own
+  player vendors, own vendor sales, own houses (home/decay status).
+- **Access-level menu**: one shared navigation that reveals items based on the signed-in user's role.
+- **Opt-in push notifications** (post-v1; architected for from the start): per-stream subscriptions the
+  user chooses — nothing is pushed unless subscribed. See §11.
+
+### Explicitly OUT of scope (never in the app, for any role)
+- The **hero editor** and any CMS authoring/block editing.
+- The **admin / auth-management console** — user management, invites issuance, SSO provider config,
+  moderation console, email config, bot-activity/ban console. (Players still *log in*; what's
+  excluded is the management surface, not authentication itself.)
+- The **Discord bot** management (and anything under the unpublished `/internal/**` port — it
+  returns the decrypted bot token and must never be reachable from a client).
+- **Shard / uo-link administration** — sidecar base-URL/token config (`uoLinkConfig`), shard ops,
+  the staff shard-user console. (The app shows *public* shard widgets and a player's *own* game
+  data; it does not manage the sidecar.)
+
+> The excluded surfaces all live under `/api/v1/admin/**` and `/api/v1/internal/**`. The app only
+> ever calls `/api/v1/public/**`, `/api/v1/auth/**` (incl. the new role-agnostic self surface
+> `/auth/me/*`, §6.4), and `/api/v1/player/**` — it never references `/admin`.
+
+---
+
+## 2. Architecture & stack
+
+Native, Android-only:
+
+| Concern | Choice |
+|---|---|
+| Language / UI | **Kotlin + Jetpack Compose** (Material 3) |
+| Navigation | Navigation-Compose, single-activity |
+| HTTP | **Retrofit + OkHttp**, `kotlinx.serialization` converter |
+| Async | Coroutines + Flow; `viewModelScope` |
+| DI | Hilt |
+| Saved base URL / prefs | **Jetpack DataStore** (Preferences) |
+| Tokens at rest | **EncryptedSharedPreferences** (Jetpack Security / Tink-backed) |
+| Live feed | OkHttp SSE (`EventSource`) for `/public/shard/stream` |
+| Images | Coil |
+| Min SDK | **Android 10 (API 29)** — ~95% device reach with a modern baseline (biometric, storage, TLS) and no compat shims |
+| Target/compile SDK | Latest stable (35) |
+| Telemetry | **None in v1** — no crash/analytics SDK (privacy-first). Revisit self-hosted crash reporting later. |
+| Localization | **Strings externalized from day one** (`res/values/strings.xml`); English is the only bundled locale, but the structure invites community translations. No hardcoded UI strings. |
+| Web hand-off | Chrome Custom Tabs — opens the website for registration / invite / password reset / SSO (§4.2) |
+
+**API model generation.** The DTOs and the Retrofit interface are generated from
+`swagger-output.json` (OpenAPI 3.0) rather than hand-written, so the client stays in lockstep with
+the backend contract. A build step (or a checked-in generated module regenerated on contract change)
+runs `openapi-generator` against the committed spec. Endpoints that return
+`additionalProperties: true` (several shard reads) are typed as permissive maps / JsonElement.
+
+**Layering** mirrors the backend's discipline: `screen (Compose) → ViewModel → repository → API
+service (Retrofit) → DTO`. Repositories expose `Result`-like sealed types so the UI degrades
+gracefully (see §7).
+
+---
+
+## 3. Base URL: first-run + settings
+
+The app is **brandable to any shard's site** (one site per install), so the API host is not
+compiled in.
+
+- **First run (before init):** a mandatory **"Connect to your shard's website"** screen asks for the
+  site base URL. The app validates it by calling `GET /api/v1/public/status` (and reads
+  `/public/settings` for branding: name/colors/logo). Only on a successful, well-formed response is
+  the URL persisted to DataStore and the app allowed to initialize its main UI.
+  - Accept `https://host[/base]`; normalize/trim; require HTTPS in release builds (allow HTTP only in
+    debug for local dev against `127.0.0.1:3000`).
+  - Failure states: unreachable, non-2xx, not-a-Runic-Gateway-site (missing expected `/public/status`
+    shape), TLS error — each gets a clear retry message. Nothing else in the app runs until this
+    succeeds.
+- **Settings:** the base URL is editable later under **Settings → Server**. Changing it is a
+  hard reset of session state: clear stored tokens, drop cached content, re-run the validation probe,
+  and return to a signed-out state against the new host.
+- **Version guard:** the backend is versioned; surface a clear "app/site version mismatch" state if a
+  future protocol/version header disagrees, rather than mis-rendering.
+
+---
+
+## 4. Authentication & token handling
+
+**Design rule (decided): credential/identity flows live on the website, not in the app.** The app
+implements **only native username/password (+TOTP) login**. Registration, invite acceptance,
+forgot/reset password, and SSO all **run through the website's API + web front end** — the app hands
+off to the website in a browser (Chrome Custom Tab) and the user returns to sign in. This keeps every
+account-provisioning, OAuth, and password path in one audited place rather than duplicated (and
+security-reviewed twice), and it means **no new mobile-facing auth endpoints** are required for v1.
+Password reset is being built on the backend + web front end **before** app work begins (§8), so it is
+simply available in that hand-off, not app scope.
+
+### 4.1 Username + password (+ TOTP) — the app's only native auth, ready today
+Uses the existing **mobile bearer** surface, no backend changes:
+
+- `POST /auth/mobile/login` `{ username, password, code? }` →
+  `{ accessToken, refreshToken, expiresIn, user: { id, username, role } }`.
+  - **Single-request 2FA:** a `401 { totpRequired: true }` means re-submit with `code`. The login
+    screen reveals a code field on that response.
+  - Respect `429` (backoff / rate-limit) with a friendly "try again shortly" state — login is guarded
+    by per-IP backoff → slow-down → hard cap on the server.
+- `POST /auth/mobile/refresh` `{ refreshToken }` → new pair. **Refresh tokens are single-use and
+  rotated**: store the new pair atomically; a failed refresh (401) means the session is dead → sign
+  out and return to login. An OkHttp `Authenticator`/interceptor performs a one-shot refresh on a
+  `401` from a bearer call, with a mutex so concurrent 401s trigger only one refresh.
+- `POST /auth/mobile/logout` `{ refreshToken?, all? }` (requires bearer) — revoke this session or all
+  sessions. Called on user logout and on "sign out everywhere."
+### 4.2 Website-handled flows: registration, invite, forgot-password, SSO
+These are **not** rebuilt in the app. The app links out to the website's own pages/API and the user
+completes them in a Custom Tab, then returns and signs in natively (§4.1):
+- **Register / accept invite** — the app opens the website's register / `…/invite/:token` pages. Invite
+  emails already link to the website. After the account exists, the user signs into the app with their
+  new username + password. (No mobile register/invite endpoints needed.)
+- **Forgot / reset password** — the app links to the website's reset page (the flow being built in §8
+  before app work). The user resets there, then signs into the app. (No mobile reset endpoint needed.)
+- **SSO (Google / Discord / OIDC)** — SSO stays the website's browser redirect flow (`/auth/sso/*`),
+  **link-only** (no auto-provisioning). For v1 the app does **not** do one-tap in-app SSO; instead an
+  SSO user links their identity and sets a password on the website (the existing "set initial password"
+  path for SSO-provisioned accounts), then uses password login in the app. `GET /auth/sso/providers`
+  can still be shown so the login screen can direct users to "sign in with … on the website."
+  - *Possible later enhancement (out of v1):* true in-app SSO via a Custom-Tab flow that hands a
+    one-time code back to an app link, exchanged for mobile tokens — a small new backend endpoint. Only
+    build it if password-for-SSO-users proves too clunky.
+
+### 4.3 Session model (all paths)
+- **Refresh:** `POST /auth/mobile/refresh` `{ refreshToken }` → new pair. **Single-use / rotated:** store
+  the new pair atomically; a failed refresh (401) means the session is dead → sign out. An OkHttp
+  `Authenticator` does a one-shot refresh on a bearer `401`, behind a mutex so concurrent 401s trigger
+  only one refresh.
+- **Logout:** `POST /auth/mobile/logout` `{ refreshToken?, all? }` (requires bearer) — this session or
+  all sessions ("sign out everywhere").
+- **Storage:** access + refresh tokens live in EncryptedSharedPreferences, never in plain prefs/logs.
+  The base URL may live in plain DataStore; tokens must not. Optional **biometric app-lock** (available
+  cleanly at API 29) gates access to the stored session — decide at M3.
+- **Role for the menu** comes from the login response `user.role` and is re-validated via
+  `GET /auth/me` on app resume (roles can change server-side; admin access is re-checked every
+  request on the backend, so the app treats role as *advisory for menu rendering* and lets the server
+  be the authority — a 403 is handled gracefully, never assumed-away).
+
+---
+
+## 5. Navigation — one shared, access-level menu
+
+A **single** navigation definition; each entry declares the minimum access it requires, and the menu
+renders only the entries the current session satisfies. Roles: `anonymous` < `player` /
+`moderator` / `editor` / `admin` (the three staff roles are not a strict ladder — gate by capability,
+not rank).
+
+| Menu group | Visible to | Backing endpoints |
+|---|---|---|
+| Home / Status | everyone | `/public/status`, `/public/settings` |
+| News & content | everyone | `/public/posts/:category`, `/public/pages/:slug` |
+| Wiki | everyone | `/public/wiki`, `/public/wiki/categories`, `/public/wiki/tags`, `/public/wiki/:slug` |
+| Shard (live) | everyone | `/public/shard/*` + `/public/shard/stream` (SSE) |
+| Contact | everyone | `/public/contact` |
+| **My Account** | signed-in | `/player/account/*` (or `/admin/account/*` for staff — see §6.4) |
+| **My Characters / Vendors / Houses** | `player` (linked) | `/player/shard/*` |
+| Sign in / Sign out | toggles on session | `/auth/mobile/*` |
+
+Guidelines:
+- The menu is **declarative + data-driven**, not a pile of `if role ==` checks — one list of entries
+  with a `minAccess`/`requiredCapability` field, filtered by the session.
+- Never hide the fact that more exists behind auth in a way that misleads; anonymous users see public
+  groups and a "Sign in" affordance.
+- The server is the source of truth: a hidden/greyed item is a UX convenience; every gated call still
+  enforces on the backend and the app handles 401/403 cleanly.
+
+---
+
+## 6. Screen ↔ endpoint map
+
+### 6.1 Public content
+- **Home/Status** — `GET /public/status`, `GET /public/settings` (branding + maintenance banner).
+- **News hub** — `GET /public/posts/:category` (`news | five-on-friday | newsletter | screenshots`),
+  detail via `GET /public/posts/:category/:idOrSlug`.
+- **CMS pages** — `GET /public/pages/:slug` (block-based; render the block types the site uses).
+- **Wiki** — list/categories/tags/detail as above.
+- **Contact** — `POST /public/contact` (rate-limited; handle 429/502).
+
+### 6.2 Public shard (live)
+- Status/online/feed/economy/champs/guilds/governors(+history)/presence/houses/idoc — the
+  `/public/shard/*` GETs.
+- **Live updates** — subscribe to `GET /public/shard/stream` (SSE, safe kinds only) and patch the
+  in-memory boards in place (champ/guild/city/house/presence update+remove frames). Reconnect with
+  backoff; fall back to poll if SSE drops.
+
+### 6.3 Player self-service & game data (bearer)
+- **Account** — `GET /player/account`; `PATCH /player/account/username`;
+  `PATCH /player/account/password`; TOTP `setup`/`enable`/`disable`; identities `GET` / `DELETE`.
+- **Game account linking** — `POST /player/shard/link` (one-time `[link` code),
+  `POST /player/shard/account` (hybrid signup, when enabled), `GET /player/shard/accounts`.
+- **My game data** — `GET /player/shard/roster/:account`, `/char/:serial`, `/vendors/:account`,
+  `/sales`, `/houses`. All ownership-checked server-side; a `503` means shard/sidecar down → show an
+  "offline, retry" state (see §7).
+- **Presentation is text-only for v1.** Character sheets and vendor listings render as data/text — no
+  item icons or paperdoll art. A richer "pretty paperdoll" view is a **future** enhancement (pending the
+  art/asset work on the platform side) and is explicitly out of the first release.
+
+### 6.4 Self-service is role-agnostic under `/auth/**` (decided)
+Player self-service is under `/player/account/*` (gated to `role='player'`) and staff use the *same*
+handlers under `/admin/account/*`. Rather than have the app branch by role (and touch `/admin`), we
+**add a role-agnostic self surface under `/auth/**`** — the canonical "me" endpoints for every role.
+The app calls these regardless of role, and never references `/admin`. This is an **additive v1**
+change (see §8): the existing `/player/account/*` and `/admin/account/*` routes stay for web
+back-compat; `/auth/me/*` reuses the same `account.controller` handlers behind `requireAuth` (any
+authenticated role), so there's no logic duplication.
+
+---
+
+## 7. Degradation & offline
+
+Mirrors the website's "degrade gracefully" invariant:
+- Every repository call returns a typed result (`Ok`/`HttpError(status)`/`NetworkError`); the UI never
+  crashes on a down backend or shard.
+- **Shard down** (`503` from shard reads, or `/public/shard/status` shows disconnected) → render the
+  shard as **offline**, keep the rest of the app usable.
+- **Site maintenance** (`/public/status` = maintenance) → show the maintenance page; public shard
+  widgets may still render (they're not maintenance-gated server-side).
+- **Offline caching is not a v1 requirement** (decided). The app assumes connectivity and shows clean
+  loading/error/retry states; it does **not** ship a Room cache in v1. Cached read-only content can be
+  added later without reworking the repository layer (its typed results already isolate the UI from the
+  data source). No `Room` dependency in the initial build.
+
+---
+
+## 8. Cross-repo work to do *before* coding the app
+
+The bridge repos are contracts; the app adds a new consumer. Land these first (in `website/` +
+`docs/`), each with regenerated Swagger.
+
+**Already verified — no change needed** (checked against the current backend):
+- **CORS / native reachability.** CORS is only enabled when `CLIENT_ORIGIN` is set (local Vite dev);
+  in prod the SPA is same-origin and CORS is off. A native HTTP client is not browser-origin-bound, so
+  no CORS/preflight applies. *Caveat:* `app.js` mounts a bot/scanner guard before routing — the app
+  must send a sane `User-Agent` so it isn't caught by scanner heuristics.
+- **`GET /auth/me` bearer support.** `auth/token.js:extractToken` reads the cookie *then* falls back to
+  `Authorization: Bearer`, and `/auth/me` advertises both auth schemes. It returns the current user for
+  a bearer token today. The entire `/player/**` and self-service surface works with bearer as-is.
+- **Token lifetimes.** Access `MOBILE_ACCESS_TTL` = 15m default; refresh `MOBILE_REFRESH_TTL_DAYS` =
+  30 days. The login/refresh response's `expiresIn` reflects the access TTL — drive proactive refresh
+  off it.
+
+**API versioning: everything below stays in v1 (decided).** These are all *additive* routes — new
+endpoints that change no existing response shape — so they do **not** warrant a v2. A v2 API is only
+justified by a breaking change to a contract existing clients depend on, which none of this is. The
+web client and the app both consume v1; a second parallel route tree + Swagger spec would be pure
+maintenance cost. Reserve v2 for a real breaking re-shape if one ever arises.
+
+**To build (all additive, v1):**
+1. **Role-agnostic self-service under `/auth/**` (§6.4, decided).** Mount the existing
+   `account.controller` self handlers behind `requireAuth` (any role), so the app has one self surface
+   and never touches `/admin`. Keep the old `/player/account/*` + `/admin/account/*` routes for web
+   back-compat. New canonical routes:
+   - `GET /auth/me` — current `{ id, username, role }` (already exists; the app's role source).
+   - `GET /auth/me/account` — full self account.
+   - `PATCH /auth/me/account/username`, `PATCH /auth/me/account/password`.
+   - `POST /auth/me/account/totp/setup|enable|disable`.
+   - `GET /auth/me/account/identities`, `DELETE /auth/me/account/identities/:provider`.
+   - Regenerate Swagger; add `#swagger` annotations for each.
+2. **Password reset — build on backend + web front end FIRST (a prerequisite, not app scope).**
+   No reset route exists anywhere today. Build the full platform flow in `website/` **before** app work
+   starts: request-reset (email a signed, single-use, expiring token) → reset page + endpoint (verify →
+   set password → revoke sessions), reusing the mail sender + `secretBox`/hashing. The app then just
+   links users to that website page (§4.2) — **no mobile reset endpoint.** Regenerate Swagger; document
+   in `BACKEND_DESIGN.md`.
+   - No mobile SSO/invite/register endpoints are needed: SSO, registration, and invite acceptance all
+     stay website-handled and the app hands off to them (§4.2). This is a deliberate scope reduction.
+3. **Push notifications** — see §11. Additive v1 endpoints under `/auth/me/devices*` and
+   `/auth/me/notifications*`, plus a **self-hosted `ntfy` service added to `website/docker-compose.yml`**
+   with fully declarative, zero-interaction config. Not required for the first release (M6, not M1–M5).
+4. **Version/health surfacing** — ensure `/public/status` (or a light `/public/version`) exposes
+   enough for the app's first-run probe and version-mismatch guard.
+5. **Docs** — update `docs/website/BACKEND_DESIGN.md` for any new/changed endpoint; keep this file and
+   the OpenAPI spec current. (The workspace `CLAUDE.md` is a **local, uncommitted** file — update it in
+   place as repos come online, but it is never committed.)
+6. **Branding for mobile** — confirm `/public/settings` returns the `BRAND_*` values (name, colors,
+   logo/hero/favicon URLs) the app needs to theme itself per shard.
+
+No `link/` or `servuo-plugins/` changes are expected — the app is downstream of the website only.
+
+---
+
+## 9. Milestones
+
+1. **M0 — Repo scaffold**: Gradle + Compose + Hilt skeleton, CI (build + lint + unit test), license
+   headers (GPL-3.0-or-later), CONTRIBUTING/AI-disclosure parity with the other repos.
+2. **M1 — Connect & browse**: first-run base-URL flow, `/public/status`+`/public/settings` theming,
+   generated API client, public content (news/wiki/pages) + contact. No auth yet.
+3. **M2 — Public shard**: shard widgets + SSE live stream with reconnect/degradation.
+4. **M3 — Auth (§4)**: native password+TOTP login (429 handling), token storage, refresh interceptor,
+   logout, `/auth/me` role re-validation, the access-level menu. Custom-Tab **hand-offs** to the website
+   for register / invite / password-reset / SSO (no native screens for those). Optional biometric
+   app-lock. *Prerequisite:* the website password-reset flow (§8) is already built.
+5. **M4 — Player self-service & game data**: account management (via `/auth/me/*`), game-account
+   linking, own roster/characters/vendors/houses/sales — **text-only** presentation (§6.3).
+6. **M5 — Polish & first release**: settings (server switch = hard reset), version-mismatch guard,
+   release build hardening (HTTPS-only, no token logging). No offline cache in v1 (§7). **Ship v1 as a
+   signed APK attached to a Gitea release** (see §10).
+7. **M6 — Push notifications** (post-v1): add the self-hosted `ntfy` service to
+   `website/docker-compose.yml` (declarative, zero-interaction config), UnifiedPush integration in the
+   app, device registration, the subscriptions UI, and the content-free-tickle backend fan-out (see
+   §11). The app is built with room for this from M0 but it does not gate the first release.
+8. **M7 — Google Play**: Play Console listing, signing/upload key, and (optionally) an FCM build flavor
+   — after the direct-APK release is stable.
+
+---
+
+## 10. Distribution
+
+- **v1: direct APK.** Build a signed release APK in CI and **attach it to a Gitea release** (mirrors
+  how `link/` cuts release binaries). Users sideload; the app already self-configures its server URL on
+  first run (§3), so one APK works for any shard. Keep a stable **upload/signing keystore** out of the
+  repo from day one — Play later requires a consistent signing identity.
+- **Later: Google Play.** Add a Play Console listing and (if using FCM) a `google-services` config as a
+  **build flavor**, so the direct-APK build stays Google-free. Versioning: semantic `versionName` +
+  monotonic `versionCode`; tag releases in the repo.
+
+## 11. Push notifications (built-for, shipped post-v1)
+
+The app is architected from M0 to accommodate push, but push itself ships in M6 — it does not block the
+first release. Users **opt in per stream**: nothing is pushed unless subscribed.
+
+### Transport — UnifiedPush via self-hosted ntfy (decided)
+- **Primary: UnifiedPush, delivered by a self-hosted `ntfy` service added to the website's
+  `docker-compose.yml`.** FOSS, no Google Play Services dependency, works for the sideloaded APK on any
+  device, and keeps delivery under the org's own infrastructure — consistent with the self-hosted ethos.
+- **FCM stays optional and Play-only.** If/when a Play build wants it, add FCM as a **build flavor**;
+  the direct-APK flavor stays Google-free. The backend fan-out is **transport-agnostic** and dispatches
+  to whatever endpoint a device registered, so adding FCM later touches no core logic.
+
+### ntfy deployment — fully automated, zero interactive setup (hard requirement)
+- Runs as an **additional service in `website/docker-compose.yml`** (the compose *pulls* images and
+  never builds — ntfy is a pinned upstream image, so this fits that model). Confirm the exact image
+  path/tag at implementation.
+- **All config is declarative** — a committed `ntfy` config file and/or `NTFY_*` env vars baked into
+  compose. No `docker exec`, no interactive `ntfy user add`, no post-deploy manual steps. Bringing the
+  stack up provisions a working push relay. Reachable to devices via the existing reverse proxy on its
+  own hostname/path; internal-only for the backend publisher.
+- **No per-user ntfy accounts to administer.** The security model (below) removes the need for ntfy ACL
+  provisioning, which is exactly what keeps setup interaction-free. ntfy topics are the random,
+  unguessable endpoints UnifiedPush hands out; the backend treats ntfy as an **untrusted relay**.
+
+### Backend (additive, v1)
+- `POST /auth/me/devices` — register a device: `{ transport, endpoint, platform }` where `endpoint` is
+  the UnifiedPush/ntfy URL the distributor gave the app (or an FCM token for a Play/FCM build). `DELETE
+  /auth/me/devices/:id` — unregister. Devices belong to the authenticated user.
+- `GET /notifications/streams` — catalog of subscribable streams + which require a linked game account.
+- `GET|PUT /auth/me/notifications/subscriptions` — the user's selected streams (per-user; applied to
+  all their devices).
+- **Fan-out worker** hangs off the existing event dispatcher (`website` `utils/shardIngest.js`) — the
+  same event source that already feeds the SSE channels — matches events against subscriptions and
+  **publishes a content-free tickle** (see below) to each matching device's endpoint. Store endpoints
+  per device. Any secret (an ntfy publish token, or an FCM server key if that flavor is used) is
+  encrypted at rest via `utils/secretBox.js`, like the other secrets.
+
+### Stream catalog (initial)
+- **Public / opt-in** (no account needed): news posts, server up/down, IDOC warnings, champion-spawn
+  starts, governor elections.
+- **Personal** (require a linked game account; delivered only to the owner): *your* vendor sold an
+  item, *your* house entered IDOC, a login to *your* account.
+
+### Security boundary (hard requirement)
+The ntfy relay is treated as **untrusted infrastructure**, and the design makes that safe:
+
+- **Content-free tickles.** A push payload carries **no sensitive data** — only a stream id and an
+  opaque reference (e.g. `{ stream: "vendor.sale", ref: "…" }`). On receipt the app wakes and **pulls
+  the actual content over the authenticated, ownership-checked API** (`/auth/me/*`, `/player/shard/*`).
+  So even if an ntfy topic name leaked, nothing meaningful leaks with it, and no data reaches a device
+  that its user isn't already entitled to fetch. This is what lets ntfy be automated with no per-user
+  ACLs while still honoring the security rules.
+- **Same allowlist split as the SSE streams.** Sensitive kinds (staff audit, cheat detection, login
+  attempts, IPs) are never fanned out to push at all — the publisher applies the identical public/safe
+  allowlist used by the SSE dispatcher.
+- **Personal events are owner-keyed.** A personal tickle (your vendor sold, your house IDOC) is
+  published **only** to the endpoints of the owning user, decided by the same ownership check as the
+  `/player/shard/*` reads — a device never receives another user's events.
+- **Transport hardening.** ntfy served over TLS via the reverse proxy; the backend→ntfy publish is
+  internal. Endpoints are unguessable random topics; unregister on logout / token revocation.
+
+### App
+- A **Notifications** settings screen lists the catalog with per-stream toggles; personal streams are
+  disabled/greyed until the user has a linked game account. Registration happens after login; toggles
+  write to `/auth/me/notifications/subscriptions`. Tapping a notification deep-links to the relevant
+  screen (§ open item below).
+
+## 12. Build & CI (Gitea Actions)
+
+Builds run on the org's existing self-hosted runners (`runs-on: ubuntu-latest`, same label the other
+repos use), on a bare `ubuntu:latest` container.
+
+- **Toolchain:** JDK **17** (temurin) for Android Gradle Plugin 8.x; Android SDK installed in-CI via
+  `android-actions/setup-android@v3` (cmdline-tools + license acceptance). Cache `~/.gradle` and the SDK.
+- **Bare-image gotcha:** `ubuntu:latest` lacks `git`/`curl`/`unzip` that `actions/checkout` and
+  `sdkmanager` need — first step `apt-get install -y git curl unzip`. (Faster option once builds are
+  frequent: run the job under a prebuilt Android-SDK `container:` image so nothing installs per-run.)
+- **PR gate** (`.gitea/workflows/pr-checks.yml`, on PR → `main`): `./gradlew lint test assembleDebug`.
+  Debug builds are auto-signed, so the gate needs no secrets. Mirrors `website/`'s pre-merge gate.
+- **Release** (`.gitea/workflows/release.yml`, M5+): build a **signed release APK** and attach it to a
+  Gitea release (mirrors `link/`'s release job). The **keystore is a base64 Gitea Actions secret**
+  decoded in CI; store/key passwords are secrets. The keystore never lives in the repo. Keep the
+  signing identity stable from the first release (Play later requires consistency).
+- Semantic `versionName` + monotonic `versionCode`; tag releases.
+
+## 13. Open questions (revisit as we go)
+
+**Decided (recorded here for context):** single shard per install (§3); native auth is
+password+TOTP only, with registration/invite/reset/SSO **handled by the website** (§4); **password
+reset built on backend + web first**, before app work (§8); minSdk 29, compile/target 35 (§2); no
+telemetry in v1 (§2); strings externalized from day one, English-only bundled (§2); **text-only** game
+data in v1, pretty paperdoll is future (§6.3); **no offline cache in v1** (§7); push via self-hosted
+ntfy / UnifiedPush (§11).
+
+**Still open:**
+- **App identity / domain.** Target application ID **`com.runicgateway.app`** — pending securing the
+  `runicgateway.app` domain (needed for a verified app-link host and a matching package namespace). Also
+  the fixed launcher name (baked at build even though in-app branding is per-shard — one APK, any shard).
+  Since SSO/invite/reset are website-handled, the app mostly *opens* website URLs rather than needing its
+  own verified app links — confirm whether any deep-link-back is wanted at all for v1.
+- ntfy: exact upstream image + pinned tag, its reverse-proxy hostname/path, and whether to add a
+  backend publish token (optional hardening — the content-free-tickle design does not require one).
+- FCM flavor: build it for the Play release or ship Play on UnifiedPush too? Decide at M7.
+- Deep-link / share targets for wiki pages, posts, and notification taps.
+- iOS: none planned (this is the Android-only choice); revisit only if cross-platform is later
+  required (would change §2 — and push, which would then favor a cross-platform transport).