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/build/_compat/importlib.py

@@ -0,0 +1,22 @@
+from __future__ import annotations
+
+import sys
+import typing
+
+
+if typing.TYPE_CHECKING:
+    import importlib_metadata as metadata
+else:
+    if sys.version_info >= (3, 10, 2):
+        from importlib import metadata
+    else:
+        try:
+            import importlib_metadata as metadata
+        except ModuleNotFoundError:
+            # helps bootstrapping when dependencies aren't installed
+            from importlib import metadata
+
+
+__all__ = [
+    'metadata',
+]

backend_service/venv/lib/python3.13/site-packages/build/_compat/tarfile.py

@@ -0,0 +1,31 @@
+from __future__ import annotations
+
+import sys
+import tarfile
+import typing
+
+
+if typing.TYPE_CHECKING:
+    TarFile = tarfile.TarFile
+
+else:
+    # Per https://peps.python.org/pep-0706/, the "data" filter will become
+    # the default in Python 3.14. The first series of releases with the filter
+    # had a broken filter that could not process symlinks correctly.
+    if (
+        (3, 9, 18) <= sys.version_info < (3, 10)
+        or (3, 10, 13) <= sys.version_info < (3, 11)
+        or (3, 11, 5) <= sys.version_info < (3, 12)
+        or (3, 12) <= sys.version_info < (3, 14)
+    ):
+
+        class TarFile(tarfile.TarFile):
+            extraction_filter = staticmethod(tarfile.data_filter)
+
+    else:
+        TarFile = tarfile.TarFile
+
+
+__all__ = [
+    'TarFile',
+]

backend_service/venv/lib/python3.13/site-packages/build/_compat/tomllib.py

@@ -0,0 +1,16 @@
+from __future__ import annotations
+
+import sys
+
+
+if sys.version_info >= (3, 11):
+    from tomllib import TOMLDecodeError, load, loads
+else:
+    from tomli import TOMLDecodeError, load, loads
+
+
+__all__ = [
+    'TOMLDecodeError',
+    'load',
+    'loads',
+]