修正ERP扫码登录服务签名契约

app/routers/erp_login.py

@@ -51,16 +51,6 @@ def _scene(ticket: str, session_id: int | None) -> str:
     return scene
 
 
-def _erp_status_error_detail(response: httpx.Response) -> Any:
-    try:
-        data = response.json()
-    except ValueError:
-        return None
-    if isinstance(data, dict):
-        return data.get("detail")
-    return None
-
-
 def _action_response(data: dict[str, Any]) -> ErpLoginActionResponse:
     return ErpLoginActionResponse(
         status=str(data.get("status") or ""),
@@ -72,8 +62,7 @@ async def _read_erp_json(response: httpx.Response) -> dict[str, Any]:
     try:
         response.raise_for_status()
     except httpx.HTTPStatusError as exc:
-        detail = _erp_status_error_detail(exc.response) or "ERP扫码登录服务暂时不可用"
-        raise HTTPException(status_code=502, detail=detail) from exc
+        raise HTTPException(status_code=502, detail="ERP扫码登录服务暂时不可用") from exc
     try:
         data = response.json()
     except ValueError as exc: