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/exceptions.pyi

@@ -0,0 +1,27 @@
+from typing import overload
+
+__all__ = [
+    "ComplexWarning",
+    "VisibleDeprecationWarning",
+    "ModuleDeprecationWarning",
+    "TooHardError",
+    "AxisError",
+    "DTypePromotionError",
+]
+
+class ComplexWarning(RuntimeWarning): ...
+class ModuleDeprecationWarning(DeprecationWarning): ...
+class VisibleDeprecationWarning(UserWarning): ...
+class RankWarning(RuntimeWarning): ...
+class TooHardError(RuntimeError): ...
+class DTypePromotionError(TypeError): ...
+
+class AxisError(ValueError, IndexError):
+    __slots__ = "_msg", "axis", "ndim"
+
+    axis: int | None
+    ndim: int | None
+    @overload
+    def __init__(self, axis: str, ndim: None = ..., msg_prefix: None = ...) -> None: ...
+    @overload
+    def __init__(self, axis: int, ndim: int, msg_prefix: str | None = ...) -> None: ...