[Polish] Simplify __repr__ method in Request class (#5153)

Remove detailed string representation for Request class.

fastdeploy/engine/request.py

@@ -310,19 +310,7 @@ class Request:
 
     def __repr__(self) -> str:
         """Safe string representation that ignores private and None fields."""
-        try:
-            if not envs.FD_DEBUG:
-                return f"Request(request_id={self.request_id})"
-            else:
-                attrs_snapshot = dict(vars(self))
-                non_none_fields = [
-                    f"{attr}={value!r}"
-                    for attr, value in attrs_snapshot.items()
-                    if value is not None and not attr.startswith("_")
-                ]
-                return f"Request({', '.join(non_none_fields)})"
-        except Exception as e:
-            return f"<{self.__class__.__name__} repr failed: {e}>"
+        return ""
 
 
 @dataclass(slots=True)