Add Discord bot (moderation, filters, scheduling, roles, invites, site integration)

Standalone bot/ service (its own package.json/Dockerfile) managed entirely
through a new admin-only Discord Bot panel — token stored encrypted in the
DB and pushed to the bot process in-memory, never an env var. Built in
phases, each independently verified against a live Discord guild:

- Bot skeleton: gateway connection, internal shared-secret API, self-heals
  on its own restart by pulling config from the site
- Moderation core: /ban /kick /mute /warn /warnings + mod-log channel
- Word/invite/spam filtering with leetspeak-resistant normalization and a
  staff role/channel allowlist
- Scheduled messages: recurring (cron) and one-off channel posts
- Role assignment: button role menus, auto-role on join, temp roles,
  bulk role ops
- Auto-rotating primary invite with an audit log
- Site integration: news-publish -> Discord announce webhook, manual
  /announce, read-only /wiki search

Also fixes a pre-existing bug in both DB pools (server + bot): the mariadb
driver defaulted to timezone 'local', silently mis-serializing bound Date
params by the host's local offset instead of the DB's UTC session.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

server/src/router/v1/admin/admin.routes.js

@@ -9,6 +9,7 @@ const ctrl = require('./admin.controller')
 const account = require('./account.controller')
 const botActivity = require('./botActivity.controller')
 const authProviders = require('./authProviders.controller')
+const discordBot = require('./discordBot.controller')
 const { isLoggedIn, requireRole } = require('../../../utils/auth')
 const noindex = require('../../../middleware/noindex')
 const validate = require('../../../middleware/validate')
@@ -530,6 +531,39 @@ adminRouter.post(
   botActivity.unbanIp,
 )
 
+// ── Discord bot control (admin only) ──────────────────────────────────
+// Phase 1: entering/enabling the bot token here — never an env var. The token
+// is write-only over this API (SECURITY note in discordBot.controller.js).
+adminRouter.get(
+  '/discord-bot/config',
+  // #swagger.tags = ['Admin · Discord Bot']
+  // #swagger.summary = 'Get Discord bot config + live status (admin only)'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.responses[200] = { description: 'Masked config + live status', content: { "application/json": { schema: { type: "object", additionalProperties: true } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[403] = { description: 'Admin role required', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  adminOnly,
+  discordBot.getConfig,
+)
+adminRouter.put(
+  '/discord-bot/config',
+  // #swagger.tags = ['Admin · Discord Bot']
+  // #swagger.summary = 'Save Discord bot config (admin only)'
+  // #swagger.description = 'token is write-only — omit/blank it to keep the existing one unchanged.'
+  // #swagger.security = [{ "cookieAuth": [] }, { "bearerAuth": [] }]
+  /* #swagger.requestBody = { required: true, content: { "application/json": { schema: { type: "object", properties: { guildId: { type: "string" }, token: { type: "string" }, enabled: { type: "boolean" } } } } } } */
+  /* #swagger.responses[200] = { description: 'Updated config + live status', content: { "application/json": { schema: { type: "object", additionalProperties: true } } } } */
+  /* #swagger.responses[400] = { description: 'Validation error, invalid token, or missing token while enabling', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[401] = { description: 'Not authenticated', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  /* #swagger.responses[403] = { description: 'Admin role required', content: { "application/json": { schema: { $ref: "#/components/schemas/Error" } } } } */
+  adminOnly,
+  body('guildId').optional({ values: 'falsy' }).isString().trim(),
+  body('token').optional({ values: 'falsy' }).isString().trim(),
+  body('enabled').optional().isBoolean(),
+  validate,
+  discordBot.saveConfig,
+)
+
 // ── Authentication providers / SSO (admin only) ───────────────────────
 adminRouter.get(
   '/auth/providers',