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/src/stores/websocket.js

@@ -31,14 +31,17 @@ export const useWebSocketStore = defineStore("websocket", () => {
 
   // Helper functions
   const getWebSocketUrl = () => {
-    // Use environment variable or fallback to ws subdomain
+    // Use environment variable or fallback
     if (import.meta.env.VITE_WS_URL) {
       return import.meta.env.VITE_WS_URL;
     }
 
-    // In production, use dedicated WebSocket domain
+    // In production, use main API domain with /ws path
     if (import.meta.env.PROD) {
-      return "wss://ws.turbotrades.dev";
+      const apiUrl =
+        import.meta.env.VITE_API_URL || "https://api.turbotrades.dev";
+      // Convert http(s):// to ws(s)://
+      return apiUrl.replace(/^http/, "ws") + "/ws";
     }
 
     // In development, use current host with ws path (for proxy)