Round 5 fixes: workerpool resize shrink, validator lazy session close, plugin config error handling, 422 message detail, tests

app/api/errors.py

@@ -23,12 +23,14 @@ async def http_exception_handler(request: Request, exc: StarletteHTTPException):
 
 async def pydantic_validation_handler(request: Request, exc: ValidationError):
     logger.error(f"Validation error: {exc}")
+    errors = exc.errors()
+    message = errors[0].get("msg", "参数验证失败") if errors else "参数验证失败"
     return JSONResponse(
         status_code=422,
         content={
             "code": 422,
-            "message": "参数验证失败",
-            "data": exc.errors(),
+            "message": message,
+            "data": errors,
         },
     )