Complete backend verification: fix syntax errors, create __init__.py files, add setup_db.py, update docker-compose for two PostgreSQL containers

backend/app/services/game_server.py

@@ -239,7 +239,7 @@ async def game_websocket_endpoint(websocket: WebSocket, game_id: int):
                 await room.send_to_player(player_id, {
                     "type": "pong",
                     "timestamp": datetime.now().isoformat(),
-                }))
+                })
     except WebSocketDisconnect:
         # Player disconnected
         await room.remove_player(player_id)
@@ -297,7 +297,7 @@ async def process_game_command(room: GameRoom, player_id: int, command: dict):
         await room.send_to_player(player_id, {
             "type": "error",
             "message": f"Invalid command type: {cmd_type}",
-        }))
+        })
         return
     
     # Broadcast command as game event