feat(backend): implement all missing endpoints, real analytics queries, and WebSocket server

- Replace stub analytics.repository.ts with real PostgreSQL queries using pg.Pool
- Add /api/guilds, /api/config, /api/auth/login, /api/ui-state (GET/POST)
- Add /api/review, /api/recordings, /api/analysis/search
- Add /api/messages/:id/reanalyze endpoint
- Add /api/analytics/heatmap and /api/analytics/topics
- Implement media routes (stub responses, backend has no Discord voice client)
- Add WebSocket server at /ws with heartbeat and broadcast functions
- Fix analytics route paths to match frontend contract (dual paths for backward compat)
- Export getPool() from database module for raw SQL queries
- Register all new routers in app.ts

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

services/backend/src/modules/voice/voice.routes.ts

@@ -1,14 +1,26 @@
 import type { Router } from "express";
 import express from "express";
+import {
+  handleConnectVoice,
+  handleDisconnectVoice,
+  handleGetVoiceChannels,
+  handleGetVoiceStatus,
+} from "./voice.controller.js";
 
 export function createVoiceRouter(): Router {
   const router = express.Router();
 
-  // TODO: Implement voice routes
-  // GET /api/voice/recordings
-  // GET /api/voice/recordings/:userId
-  // POST /api/voice/connect
-  // POST /api/voice/disconnect
+  // GET /api/status
+  router.get("/status", handleGetVoiceStatus);
+
+  // POST /api/connect
+  router.post("/connect", handleConnectVoice);
+
+  // POST /api/disconnect
+  router.post("/disconnect", handleDisconnectVoice);
+
+  // GET /api/guilds/:guildId/voice-channels
+  router.get("/guilds/:guildId/voice-channels", handleGetVoiceChannels);
 
   return router;
 }