feat: Add WebSocket ping/pong + detailed streaming debug + initial review messages

backend/app/main.py

@@ -122,14 +122,37 @@ async def health_check():
 async def websocket_endpoint(websocket: WebSocket):
     """WebSocket endpoint for real-time review updates"""
     await manager.connect(websocket)
+    print(f"✅ WebSocket connected. Total connections: {len(manager.active_connections)}")
+    
     try:
+        # Send welcome message
+        await websocket.send_json({
+            "type": "connection",
+            "status": "connected",
+            "message": "WebSocket подключен к серверу review",
+            "timestamp": __import__('datetime').datetime.utcnow().isoformat()
+        })
+        
         while True:
-            # Keep connection alive
+            # Keep connection alive and handle client messages
             data = await websocket.receive_text()
-            # Echo back or handle client messages if needed
-            await websocket.send_json({"type": "pong", "message": "connected"})
+            print(f"📨 Received from client: {data}")
+            
+            # Handle ping/pong
+            if data == "ping":
+                await websocket.send_json({
+                    "type": "pong",
+                    "timestamp": __import__('datetime').datetime.utcnow().isoformat()
+                })
+            else:
+                # Echo back for debugging
+                await websocket.send_json({
+                    "type": "echo",
+                    "message": f"Получено: {data}"
+                })
     except WebSocketDisconnect:
         manager.disconnect(websocket)
+        print(f"❌ WebSocket disconnected. Remaining connections: {len(manager.active_connections)}")
 
 
 async def broadcast_review_update(review_id: int, event_type: str, data: dict = None):