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/fft/helper.pyi

@@ -0,0 +1,22 @@
+from typing import Any
+from typing import Literal as L
+
+from typing_extensions import deprecated
+
+import numpy as np
+from numpy._typing import ArrayLike, NDArray, _ShapeLike
+
+from ._helper import integer_types as integer_types
+
+__all__ = ["fftfreq", "fftshift", "ifftshift", "rfftfreq"]
+
+###
+
+@deprecated("Please use `numpy.fft.fftshift` instead.")
+def fftshift(x: ArrayLike, axes: _ShapeLike | None = None) -> NDArray[Any]: ...
+@deprecated("Please use `numpy.fft.ifftshift` instead.")
+def ifftshift(x: ArrayLike, axes: _ShapeLike | None = None) -> NDArray[Any]: ...
+@deprecated("Please use `numpy.fft.fftfreq` instead.")
+def fftfreq(n: int | np.integer, d: ArrayLike = 1.0, device: L["cpu"] | None = None) -> NDArray[Any]: ...
+@deprecated("Please use `numpy.fft.rfftfreq` instead.")
+def rfftfreq(n: int | np.integer, d: ArrayLike = 1.0, device: L["cpu"] | None = None) -> NDArray[Any]: ...