fix(frontend): correct WebSocket URLs and ports

- Backend WS: Changed from localhost:3000/ws/trading to localhost:3080/ws
- ML Engine WS: Changed from localhost:8001 to localhost:3083
- Portfolio WS: Changed from localhost:3000/ws/portfolio to localhost:3080/ws
- Backend uses single /ws path with message types for channel differentiation
- ML Engine has dedicated /ws/signals endpoint

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

src/services/websocket.service.ts

@@ -127,17 +127,21 @@ export class WebSocketService {
 // Pre-configured WebSocket instances
 // ============================================================================
 
-const WS_BASE_URL = import.meta.env.VITE_WS_URL || 'ws://localhost:3000';
+// Backend WebSocket (Express.js) - port 3080
-const ML_WS_URL = import.meta.env.VITE_ML_WS_URL || 'ws://localhost:8001';
+const WS_BASE_URL = import.meta.env.VITE_WS_URL || 'ws://localhost:3080';
+// ML Engine WebSocket (FastAPI) - port 3083
+const ML_WS_URL = import.meta.env.VITE_ML_WS_URL || 'ws://localhost:3083';
 
 // Trading WebSocket - for market data and order updates
+// Backend uses single /ws path with message types for differentiation
 export const tradingWS = new WebSocketService({
-  url: `${WS_BASE_URL}/ws/trading`,
+  url: `${WS_BASE_URL}/ws`,
   reconnectInterval: 3000,
   maxReconnectAttempts: 20,
 });
 
 // ML Signals WebSocket - for real-time ML predictions
+// ML Engine (FastAPI) has dedicated /ws/signals endpoint
 export const mlSignalsWS = new WebSocketService({
   url: `${ML_WS_URL}/ws/signals`,
   reconnectInterval: 5000,
@@ -145,8 +149,9 @@ export const mlSignalsWS = new WebSocketService({
 });
 
 // Portfolio WebSocket - for real-time portfolio updates
+// Uses same backend WebSocket with portfolio: prefixed message types
 export const portfolioWS = new WebSocketService({
-  url: `${WS_BASE_URL}/ws/portfolio`,
+  url: `${WS_BASE_URL}/ws`,
   reconnectInterval: 5000,
   maxReconnectAttempts: 15,
 });