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/numpy/_globals.pyi

@@ -0,0 +1,17 @@
+__all__ = ["_CopyMode", "_NoValue"]
+
+import enum
+from typing import Final, final
+
+@final
+class _CopyMode(enum.Enum):
+    ALWAYS = True
+    NEVER = False
+    IF_NEEDED = 2
+
+    def __bool__(self, /) -> bool: ...
+
+@final
+class _NoValueType: ...
+
+_NoValue: Final[_NoValueType] = ...