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/media/media.routes.ts

@@ -1,13 +1,64 @@
-import type { Router } from "express";
+import type { Request, Response, Router } from "express";
 import express from "express";
+import { createChildLogger } from "../../shared/logger/index.js";
+import { asyncHandler } from "../../shared/middlewares/index.js";
+
+const logger = createChildLogger("media.routes");
+
+const stubResponse = {
+  playing: false,
+  musicVolume: 1.0,
+  current: null,
+  queue: [],
+};
 
 export function createMediaRouter(): Router {
   const router = express.Router();
 
-  // TODO: Implement media routes
-  // GET /api/media/list
-  // POST /api/media/upload
-  // GET /api/media/:id
+  // GET /api/media/status
+  router.get(
+    "/media/status",
+    asyncHandler(async (_req: Request, res: Response) => {
+      logger.debug("Media status requested");
+      res.json(stubResponse);
+    }),
+  );
+
+  // POST /api/media/queue
+  router.post(
+    "/media/queue",
+    asyncHandler(async (_req: Request, res: Response) => {
+      logger.debug("Media queue requested (stub)");
+      res.json(stubResponse);
+    }),
+  );
+
+  // POST /api/media/skip
+  router.post(
+    "/media/skip",
+    asyncHandler(async (_req: Request, res: Response) => {
+      logger.debug("Media skip requested (stub)");
+      res.json(stubResponse);
+    }),
+  );
+
+  // POST /api/media/stop
+  router.post(
+    "/media/stop",
+    asyncHandler(async (_req: Request, res: Response) => {
+      logger.debug("Media stop requested (stub)");
+      res.json(stubResponse);
+    }),
+  );
+
+  // POST /api/media/volume
+  router.post(
+    "/media/volume",
+    asyncHandler(async (_req: Request, res: Response) => {
+      logger.debug("Media volume requested (stub)");
+      res.json(stubResponse);
+    }),
+  );
 
   return router;
 }