Add WebSocket URL to backend config API - frontend now reads from backend .env

- Added websocket.url to backend config
- Updated /api/config/public endpoint to return WebSocket URL
- Frontend now fetches WS URL from backend config API
- Falls back to environment variable or auto-generated URL
- Add WS_URL to backend .env: wss://api.turbotrades.dev/ws

routes/config.js

@@ -1,4 +1,5 @@
 import SiteConfig from "../models/SiteConfig.js";
+import { config as appConfig } from "../config/index.js";
 
 /**
  * Public configuration routes
@@ -22,6 +23,11 @@ export default async function configRoutes(fastify, options) {
             scheduledEnd: config.maintenance.scheduledEnd,
           },
 
+          // WebSocket URL
+          websocket: {
+            url: appConfig.websocket.url,
+          },
+
           // Features
           features: {
             twoFactorAuth: config.features.twoFactorAuth,