chore: 添加虚拟环境到仓库

- 添加 backend_service/venv 虚拟环境
- 包含所有Python依赖包
- 注意：虚拟环境约393MB，包含12655个文件

backend_service/venv/lib/python3.13/site-packages/google/protobuf/any.py

@@ -0,0 +1,53 @@
+# Protocol Buffers - Google's data interchange format
+# Copyright 2008 Google Inc.  All rights reserved.
+#
+# Use of this source code is governed by a BSD-style
+# license that can be found in the LICENSE file or at
+# https://developers.google.com/open-source/licenses/bsd
+
+"""Contains the Any helper APIs."""
+
+from typing import Optional, TypeVar
+
+from google.protobuf import descriptor
+from google.protobuf.message import Message
+
+from google.protobuf.any_pb2 import Any
+
+
+_MessageT = TypeVar('_MessageT', bound=Message)
+
+
+def pack(
+    msg: Message,
+    type_url_prefix: Optional[str] = 'type.googleapis.com/',
+    deterministic: Optional[bool] = None,
+) -> Any:
+  any_msg = Any()
+  any_msg.Pack(
+      msg=msg, type_url_prefix=type_url_prefix, deterministic=deterministic
+  )
+  return any_msg
+
+
+def unpack(any_msg: Any, msg: Message) -> bool:
+  return any_msg.Unpack(msg=msg)
+
+
+def unpack_as(any_msg: Any, message_type: type[_MessageT]) -> _MessageT:
+  unpacked = message_type()
+  if unpack(any_msg, unpacked):
+    return unpacked
+  else:
+    raise TypeError(
+        f'Attempted to unpack {type_name(any_msg)} to'
+        f' {message_type.__qualname__}'
+    )
+
+
+def type_name(any_msg: Any) -> str:
+  return any_msg.TypeName()
+
+
+def is_type(any_msg: Any, des: descriptor.Descriptor) -> bool:
+  return any_msg.Is(des)