feat: 实现统一的错误处理机制和增强日志系统

添加错误码定义和统一响应格式
增强日志记录功能，支持模块专用日志记录器
实现全局异常捕获和友好错误提示
更新文档说明错误处理机制

tests/test_ws.py

@@ -37,14 +37,18 @@ class TestWS:
             
             # 测试 WebSocket 未初始化的情况
             result = await ws.call_api("send_group_msg", {"group_id": 123456, "message": "test"})
-            assert result == {"status": "failed", "msg": "websocket not initialized"}
+            assert result["code"] == 2002  # WS_DISCONNECTED
+            assert result["success"] == False
+            assert "WebSocket未初始化" in result["message"]
             
             # 测试 WebSocket 已初始化但未连接的情况
             mock_ws = MagicMock()
             mock_ws.state = None
             ws.ws = mock_ws
             result = await ws.call_api("send_group_msg", {"group_id": 123456, "message": "test"})
-            assert result == {"status": "failed", "msg": "websocket is not open"}
+            assert result["code"] == 2002  # WS_DISCONNECTED
+            assert result["success"] == False
+            assert "WebSocket连接未打开" in result["message"]
 
     @pytest.mark.asyncio
     async def test_on_event_bot_initialization(self):