refactor(server): split public, player and residual auth into capability routers (PR 5)

The last split PR of docs/website/API_V2_PLAN.md § Phase 2. public.routes.js,
player.routes.js and auth.routes.js are deleted; each group is now a directory
whose index.js owns the group gate and the mount table and declares no routes.
Every one of the 200 manifest routes is now in a capability router.

  public/  posts (2) wiki (4) pages (2) shard (12) site (4, group root)
  player/  account (8) shard (8) appeals (4), behind noindex + requireAuth
  auth/    login (2) register (1) invite (2) password (3) session (2, root)

No URL moves. All four gates zero-diff: routes.manifest.json (200 public + 2
internal), routes.guards.json, swagger-output.json (198 operations), and
docs/website/api-route-inventory.json was already in sync. 434 tests green.

Notes on the non-mechanical parts:

- public/index.js and auth/index.js carry no group gate, deliberately, and say
  so. The public surface is anonymous by contract (logged-out SPA, Discord bot,
  Android ShardStreamClient on /public/shard/stream); /auth is where a caller
  becomes authenticated. player/index.js gates on requireAuth only, never
  requireRole('player') — staff are a superset of players.
- GET /auth/me has a mount-order dependency: use('/me', meRouter) matches the
  bare /me, so the request runs meRouter's noindex + requireAuth and falls
  through. session.router.js must stay mounted last. Verified by the
  counterfactual — mounting it first still 401s but drops X-Robots-Tag, which
  no manifest or guards file can see.
- loginGuards moved to auth/loginGuards.js (frozen) rather than being copied
  into the three routers that spread it; sso.routes.js drops its duplicate.
- The :param shadowing check was re-run in dispatch order against the built
  stack: 86 routes, 64 literal, none shadowed. /public/wiki/{categories,tags}
  ahead of /:slug is the only ordering-sensitive pair.

Co-Authored-By: Claude <noreply@anthropic.com>

server/src/router/v1/player/appeals.router.js

@@ -0,0 +1,73 @@
+// Player · Appeals — a player appeals one of their own ban/mute mod_actions.
+// Ownership is proven by matching the action against the caller's linked Discord
+// identity (see appeals.controller); the staff side of the queue lives in
+// admin/moderation.router.js.
+//
+// Mounted at /api/v1/player/appeals by player/index.js, which already applied
+// `noindex, requireAuth`. No extra gate — every handler is self-scoped.
+//
+// Declaration order: GET /eligible is a literal path and sits ahead of the only
+// :param route (POST /:id/withdraw), which is a different method at a different
+// depth, so nothing here can shadow anything else.
+
+const express = require('express')
+const { body, param } = require('express-validator')
+
+const appeals = require('./appeals.controller')
+const validate = require('../../../middleware/validate')
+const { accountChangeLimiter } = require('../../../middleware/rateLimit')
+
+const appealsRouter = express.Router()
+
+appealsRouter.get(
+  '/',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'List the caller’s moderation appeals'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'The caller’s appeals', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/Appeal" } } } } } */
+  /* #swagger.responses[403] = { description: 'Account not active (disabled/banned)', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  appeals.listMine,
+)
+appealsRouter.get(
+  '/eligible',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'List the caller’s ban/mute actions eligible for appeal'
+  // #swagger.description = 'The caller’s ban/mute mod_actions that have no active appeal. Returns an empty array when the caller has no linked Discord account (the UI shows a “link Discord” hint).'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Appealable actions', content: { "application/json": { schema: { type: "array", items: { $ref: "#/components/schemas/AppealEligibleAction" } } } } } */
+  /* #swagger.responses[403] = { description: 'Account not active (disabled/banned)', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  appeals.listEligible,
+)
+appealsRouter.post(
+  '/',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'Submit a moderation appeal for one of the caller’s actions'
+  // #swagger.description = 'Opens an appeal for a ban/mute mod_action that belongs to the caller (its target matches the caller’s linked Discord identity) and has no active appeal.'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.requestBody = { required: true, content: { "application/json": { schema: { $ref: "#/components/schemas/CreateAppealRequest" } } } } */
+  /* #swagger.responses[201] = { description: 'Appeal created', content: { "application/json": { schema: { $ref: "#/components/schemas/Appeal" } } } } */
+  /* #swagger.responses[400] = { description: 'Validation error, or the action type is not appealable', content: { "application/json": { schema: { $ref: "#/components/schemas/ValidationError" } } } } */
+  /* #swagger.responses[403] = { description: 'The action does not belong to the caller', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[404] = { description: 'Mod action not found', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[409] = { description: 'An appeal for this action is already open', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  accountChangeLimiter,
+  body('mod_action_id').isInt({ min: 1 }).toInt(),
+  body('submitted_text').isString().trim().isLength({ min: 1, max: 4000 }),
+  validate,
+  appeals.create,
+)
+appealsRouter.post(
+  '/:id/withdraw',
+  // #swagger.tags = ['Player · Appeals']
+  // #swagger.summary = 'Withdraw one of the caller’s pending appeals'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  // #swagger.parameters['id'] = { in: 'path', required: true, schema: { type: 'integer' }, description: 'Appeal id (must belong to the caller).' }
+  /* #swagger.responses[200] = { description: 'The withdrawn appeal', content: { "application/json": { schema: { $ref: "#/components/schemas/Appeal" } } } } */
+  /* #swagger.responses[404] = { description: 'No such appeal for the caller', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[409] = { description: 'Appeal is already resolved', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  param('id').isInt({ min: 1 }),
+  validate,
+  appeals.withdraw,
+)
+
+module.exports = appealsRouter