[OQI-008] feat: Initialize portfolio WebSocket service in server

- Import and initialize portfolioWebSocket in index.ts
- Add graceful shutdown for portfolioWebSocket
- Enable real-time portfolio updates via WebSocket

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

src/index.ts

@@ -18,6 +18,12 @@ import { setupSwagger } from './config/swagger.config.js';
 // WebSocket
 import { wsManager, tradingStreamService } from './core/websocket/index.js';
 
+// Background Jobs
+import { distributionJob } from './modules/investment/jobs/index.js';
+
+// Portfolio WebSocket
+import { portfolioWebSocket } from './modules/portfolio/websocket/portfolio.websocket.js';
+
 // Import routes
 import { authRouter } from './modules/auth/auth.routes.js';
 import { usersRouter } from './modules/users/users.routes.js';
@@ -30,6 +36,7 @@ import { mlRouter } from './modules/ml/ml.routes.js';
 import { llmRouter } from './modules/llm/llm.routes.js';
 import { portfolioRouter } from './modules/portfolio/portfolio.routes.js';
 import { agentsRouter } from './modules/agents/agents.routes.js';
+import { notificationRouter } from './modules/notifications/notification.routes.js';
 
 // Service clients for health checks
 import { tradingAgentsClient, mlEngineClient, llmAgentClient } from './shared/clients/index.js';
@@ -145,6 +152,7 @@ apiRouter.use('/ml', mlRouter);
 apiRouter.use('/llm', llmRouter);
 apiRouter.use('/portfolio', portfolioRouter);
 apiRouter.use('/agents', agentsRouter);
+apiRouter.use('/notifications', notificationRouter);
 
 // Mount API router
 app.use('/api/v1', apiRouter);
@@ -161,6 +169,10 @@ const httpServer = createServer(app);
 // Initialize WebSocket
 wsManager.initialize(httpServer);
 tradingStreamService.initialize();
+portfolioWebSocket.initialize();
+
+// Start background jobs
+distributionJob.start();
 
 // WebSocket stats endpoint
 app.get('/api/v1/ws/stats', (req: Request, res: Response) => {
@@ -183,6 +195,8 @@ httpServer.listen(PORT, () => {
 // Graceful shutdown
 const gracefulShutdown = () => {
   logger.info('Shutting down gracefully...');
+  distributionJob.stop();
+  portfolioWebSocket.shutdown();
   tradingStreamService.shutdown();
   wsManager.shutdown();
   httpServer.close(() => {