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/util.py

@@ -0,0 +1,63 @@
+# SPDX-License-Identifier: MIT
+
+from __future__ import annotations
+
+import pathlib
+import tempfile
+
+import pyproject_hooks
+
+from . import ProjectBuilder
+from ._compat import importlib
+from ._types import StrPath, SubprocessRunner
+from .env import DefaultIsolatedEnv
+
+
+def _project_wheel_metadata(builder: ProjectBuilder) -> importlib.metadata.PackageMetadata:
+    with tempfile.TemporaryDirectory() as tmpdir:
+        path = pathlib.Path(builder.metadata_path(tmpdir))
+        metadata = importlib.metadata.PathDistribution(path).metadata
+        assert metadata is not None
+        return metadata
+
+
+def project_wheel_metadata(
+    source_dir: StrPath,
+    isolated: bool = True,
+    *,
+    runner: SubprocessRunner = pyproject_hooks.quiet_subprocess_runner,
+) -> importlib.metadata.PackageMetadata:
+    """
+    Return the wheel metadata for a project.
+
+    Uses the ``prepare_metadata_for_build_wheel`` hook if available,
+    otherwise ``build_wheel``.
+
+    :param source_dir: Project source directory
+    :param isolated: Whether or not to run invoke the backend in the current
+                     environment or to create an isolated one and invoke it
+                     there.
+    :param runner: An alternative runner for backend subprocesses
+    """
+
+    if isolated:
+        with DefaultIsolatedEnv() as env:
+            builder = ProjectBuilder.from_isolated_env(
+                env,
+                source_dir,
+                runner=runner,
+            )
+            env.install(builder.build_system_requires)
+            env.install(builder.get_requires_for_build('wheel'))
+            return _project_wheel_metadata(builder)
+    else:
+        builder = ProjectBuilder(
+            source_dir,
+            runner=runner,
+        )
+        return _project_wheel_metadata(builder)
+
+
+__all__ = [
+    'project_wheel_metadata',
+]