feat(realtime): add websocket gateway and command ack/retry flow

Backend/index.ts

@@ -1,4 +1,5 @@
 import express from 'express';
+import { createServer } from 'http';
 import { toNodeHandler } from 'better-auth/node';
 import swaggerUi from 'swagger-ui-express';
 
@@ -8,6 +9,8 @@ import videosRoutes from './routes/videos';
 import adminRoutes from './routes/admin';
 import devicesRoutes from './routes/devices';
 import deviceLinksRoutes from './routes/device-links';
+import commandsRoutes from './routes/commands';
+import { setupRealtimeGateway } from './realtime/gateway';
 import { ensureMinioBucket } from './utils/minio';
 
 const app = express();
@@ -30,6 +33,7 @@ app.use('/videos', videosRoutes);
 app.use('/admin', adminRoutes);
 app.use('/devices', devicesRoutes);
 app.use('/device-links', deviceLinksRoutes);
+app.use('/commands', commandsRoutes);
 
 app.use((err: unknown, _req: express.Request, res: express.Response, _next: express.NextFunction) => {
   console.error(err);
@@ -37,6 +41,7 @@ app.use((err: unknown, _req: express.Request, res: express.Response, _next: expr
 });
 
 const port = Number(process.env.PORT ?? 3000);
+const server = createServer(app);
 
 const start = async () => {
   try {
@@ -46,7 +51,9 @@ const start = async () => {
     process.exit(1);
   }
 
-  app.listen(port, () => {
+  setupRealtimeGateway(server);
+
+  server.listen(port, () => {
     console.log(`Server is running on port ${port}`);
   });
 };