feat(moderation): appeals (6c) + Discord reversal on approve (6d)

Players whose linked Discord identity was banned or muted can now submit
an appeal from the portal and track it; staff get a queue in the admin
moderation section to claim and resolve (approve/deny) appeals. Approving
a ban/mute appeal best-effort asks the Discord bot to reverse the action
(unban / clear timeout) via the internal API and posts a mod-log embed; a
down bot never fails the resolution (reversal_status is recorded).

- Schema: new server-owned `appeals` table (no cross-owner FK to
  mod_actions; existence validated in app code).
- Server: model/appeals/* + player appeals controller (submit/mine/
  eligible/withdraw) and admin queue handlers (list/claim/resolve/
  per-user) under the existing admin+moderator gate; one-active-appeal
  enforced app-side; eligibility keyed on the caller's linked Discord id.
- 6d: bot POST /internal/mod-reverse (+ modLog.postReversal) and
  server botInternalClient.reverseModAction, wired into resolve().
- Client: admin Appeals queue + resolve modal, ModerationUser appeals
  tab, player Appeals page (submit/withdraw), nav + routes + api methods.
- Docs: swagger annotations + component schemas, regenerated output.
- Tests: appeals controller + pure suites (server npm test 224 green).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01XmHdsbnLzDMAVQkAoTQSBe

client/src/api/client.js

@@ -242,6 +242,21 @@ export const api = {
     addModNote: (discordId, data) =>
       req(`/admin/moderation/user/${discordId}/notes`, { method: 'POST', body: data }),
 
+    // ----- moderation appeals (admin + moderator) -----
+    getAppeals: (params = {}) => {
+      const qs = new URLSearchParams()
+      if (params.status) qs.set('status', params.status)
+      if (params.limit) qs.set('limit', params.limit)
+      if (params.offset) qs.set('offset', params.offset)
+      const s = qs.toString()
+      return req(`/admin/moderation/appeals${s ? `?${s}` : ''}`)
+    },
+    getAppeal: (id) => req(`/admin/moderation/appeals/${id}`),
+    claimAppeal: (id) => req(`/admin/moderation/appeals/${id}/claim`, { method: 'POST' }),
+    resolveAppeal: (id, data) =>
+      req(`/admin/moderation/appeals/${id}/resolve`, { method: 'POST', body: data }),
+    getUserAppeals: (discordId) => req(`/admin/moderation/user/${discordId}/appeals`),
+
     // ----- account security (self-service 2FA) -----
     getAccount: () => req('/admin/account'),
     totpSetup: () => req('/admin/account/totp/setup', { method: 'POST' }),
@@ -330,6 +345,12 @@ export const api = {
       createAccount: (account, password) =>
         req('/player/shard/account', { method: 'POST', body: { account, password } }),
     },
+
+    // ----- moderation appeals (self-service) -----
+    getMyAppeals: () => req('/player/appeals'),
+    getEligibleAppeals: () => req('/player/appeals/eligible'),
+    submitAppeal: (data) => req('/player/appeals', { method: 'POST', body: data }),
+    withdrawAppeal: (id) => req(`/player/appeals/${id}/withdraw`, { method: 'POST' }),
   },
 }