fix(web): guard MAC client None + filter _raw bytes from Ex responses

- get_mac_client() now raises TdxConnectionError (503) when MAC client
  is None, matching get_ex_client() behavior. Previously returned None
  causing AttributeError (500) on all 12 MAC endpoints.
- _records_to_df_resp() filters out internal _raw: bytes fields from
  Ex dataclass models. Previously asdict() included binary protocol
  data that is not JSON-serializable and would cause 500 errors.

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

src/easy_tdx/web/deps.py

@@ -17,7 +17,11 @@ def get_client(request: Request) -> AsyncTdxClient:
 
 def get_mac_client(request: Request) -> Any:
     """从 app.state 获取共享的 AsyncMacClient 实例。"""
-    client: Any = request.app.state.mac_client
+    from easy_tdx.exceptions import TdxConnectionError
+
+    client: Any | None = request.app.state.mac_client
+    if client is None:
+        raise TdxConnectionError("MAC 客户端未连接")
     return client
 
 

src/easy_tdx/web/routers/ex_market.py

@@ -15,12 +15,13 @@ router = APIRouter(tags=["ex-market"])
 
 
 def _records_to_df_resp(records: list[Any]) -> DataFrameResponse:
-    """将 dataclass 列表转为 DataFrameResponse。"""
+    """将 dataclass 列表转为 DataFrameResponse（过滤内部 _raw 字段）。"""
     import pandas as pd
 
     if not records:
         return DataFrameResponse(data=[], count=0)
-    df = pd.DataFrame([asdict(r) for r in records])
+    rows = [{k: v for k, v in asdict(r).items() if not k.startswith("_")} for r in records]
+    df = pd.DataFrame(rows)
     return DataFrameResponse.from_dataframe(df)