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/tqdm/version.py

@@ -0,0 +1,9 @@
+"""`tqdm` version detector. Precedence: installed dist, git, 'UNKNOWN'."""
+try:
+    from ._dist_ver import __version__
+except ImportError:
+    try:
+        from setuptools_scm import get_version
+        __version__ = get_version(root='..', relative_to=__file__)
+    except (ImportError, LookupError):
+        __version__ = "UNKNOWN"