Fix WebSocket connection - use main API domain instead of ws subdomain

- Updated WebSocket URL to use api.turbotrades.dev instead of ws.turbotrades.dev
- Added frontend .env.production with correct VITE_WS_URL
- Added frontend .env.development for local development
- WebSocket now connects to wss://api.turbotrades.dev/ws

frontend/.env.production

@@ -0,0 +1,16 @@
+# Production Environment Variables for Frontend
+# These are embedded at build time by Vite
+
+# API URL - Backend API endpoint
+VITE_API_URL=https://api.turbotrades.dev
+
+# WebSocket URL - Backend WebSocket endpoint
+# If not set, will auto-generate from VITE_API_URL
+VITE_WS_URL=wss://api.turbotrades.dev/ws
+
+# App Configuration
+VITE_APP_NAME=TurboTrades
+VITE_APP_ENV=production
+
+# Feature Flags
+VITE_ENABLE_DEBUG=false