feat(rust): chat titles, BetterChat group styles, the voice and popups (phase 17)

PLAN.md §33, D134-D143. Protocol 12.

- Chat titles (D135-D137): per-server rules (stat, top N, text, colour)
  that rank the current wipe, and a mode (first | all | up to N). Worked
  out once in model/titles and read three ways: pushed whole to the game by
  a new titleSync loop (on change, restart or wipe), and on every
  leaderboard row as `titles`. Admin: PUT /servers/:id/titles.
- Group styles (D138, D139): a site group may carry all twelve BetterChat
  fields (rust_perm_group_chat). They ride perm.sync with `expect` from the
  pushed ledger, which gains a value column; a field changed in game is a
  `chat-field` drift row with the game's value, adopted into the style or
  put back. A withdrawn style is one `chat-group` retirement, never for
  `default`, cleared from the ledger only once BetterChat removed it.
- The voice (D140): one fleet setting naming a styled group; news and
  rust.announce chat lines carry its format and the plugin says them with
  no sender. Admin: GET/PUT /voice.
- Popups (D141, D142): rust.announce gains `delivery` (still version 1,
  from rust.options.delivery); each server gains news_delivery beside the
  news switch; `popup-unavailable` is not retried.
- GET /servers/:id/integrations reads, live, which optional mods a server
  has loaded. README lists BetterChat and PopupNotifications as optional.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01E14m6SuuY6i1vASFeGDBeY

server/db/schema.sql

@@ -927,3 +927,65 @@ ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS wipe_time CHAR(5) NULL;
 ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS wipe_tz VARCHAR(64) NULL;
 ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS wipe_anchor DATE NULL;
 ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS wipe_once_at DATETIME NULL;
+
+-- ── The optional mods (phase 17, protocol 12) ─────────────────────────────
+--
+-- Chat titles (D135): an operator's rules, per server, in their own order. A
+-- rule ranks the CURRENT wipe by one stat and gives its top N a title. The
+-- titles themselves are not stored: they are computed from the standings each
+-- time they are pushed or shown, so nothing rolls them over at a wipe and
+-- nothing can go stale (`model/titles`).
+--
+--   stat      `kills` · `npckills` · `playtime`
+--   top_n     1–10
+--   text      at most 24 characters, with `[ ] < > { }` stripped on save so an
+--             operator's title can carry no markup of its own (§33.4)
+--   color     `#rrggbb`
+--   position  the operator's order, which is also precedence (D136)
+CREATE TABLE IF NOT EXISTS rust_title_rules (
+  id         INT UNSIGNED  NOT NULL AUTO_INCREMENT PRIMARY KEY,
+  server_id  VARCHAR(64)   NOT NULL,
+  position   INT           NOT NULL DEFAULT 0,
+  stat       VARCHAR(16)   NOT NULL,
+  top_n      TINYINT       NOT NULL DEFAULT 1,
+  text       VARCHAR(24)   NOT NULL,
+  color      CHAR(7)       NOT NULL DEFAULT '#ffaa55',
+  KEY idx_rust_title_rules_server (server_id, position),
+  CONSTRAINT fk_rust_title_rules_server
+    FOREIGN KEY (server_id) REFERENCES rust_servers (id) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- How many titles one player shows (D136): `first` the first rule they meet,
+-- `all`, or `upto` `title_max` of them. A word this build does not know reads
+-- as `first`, the fewest.
+ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS title_mode VARCHAR(8) NOT NULL DEFAULT 'first';
+ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS title_max TINYINT NOT NULL DEFAULT 2;
+
+-- Where a news post goes on this server when `announce_news` is on (D142):
+-- `chat` or `popup`. A popup needs PopupNotifications, which is optional
+-- (D141), and a server without it refuses with a reason.
+ALTER TABLE rust_servers ADD COLUMN IF NOT EXISTS news_delivery VARCHAR(8) NOT NULL DEFAULT 'chat';
+
+-- A group's BetterChat style (D138): all twelve fields or none, one row each,
+-- as the text BetterChat's own `chat group set` takes. A style is authored with
+-- the group and dies with it; the push, the drift and the removal (D139) are the
+-- permission mirror's, like everything else about a group.
+CREATE TABLE IF NOT EXISTS rust_perm_group_chat (
+  group_name  VARCHAR(64)   NOT NULL,
+  field       VARCHAR(32)   NOT NULL,
+  value       VARCHAR(255)  NOT NULL,
+  PRIMARY KEY (group_name, field),
+  CONSTRAINT fk_rust_perm_group_chat_group
+    FOREIGN KEY (group_name) REFERENCES rust_perm_groups (name) ON DELETE CASCADE
+) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4;
+
+-- What a pushed style field HELD when it landed (kind `chat-field`, subject the
+-- group, object the field). Every other ledger row is a fact with no value — a
+-- grant is held or it is not — and a field is not: the value is what tells a
+-- field this site set from one somebody changed by hand (§33.2). NULL on every
+-- other kind.
+ALTER TABLE rust_perm_pushed ADD COLUMN IF NOT EXISTS value VARCHAR(255) NULL;
+
+-- The value a changed field holds in the game, for a `chat-field` drift row.
+-- NULL on every other kind: a foreign grant is its own description.
+ALTER TABLE rust_perm_drift ADD COLUMN IF NOT EXISTS detail VARCHAR(255) NULL;