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/kubernetes/client/apis/__init__.py

@@ -0,0 +1,13 @@
+from __future__ import absolute_import
+import warnings
+
+# flake8: noqa
+
+# alias kubernetes.client.api package and print deprecation warning
+from kubernetes.client.api import *
+
+warnings.filterwarnings('default', module='kubernetes.client.apis')
+warnings.warn(
+    "The package kubernetes.client.apis is renamed and deprecated, use kubernetes.client.api instead (please note that the trailing s was removed).",
+    DeprecationWarning
+)