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/starlette/_utils.py

@@ -0,0 +1,103 @@
+from __future__ import annotations
+
+import functools
+import sys
+from collections.abc import Awaitable, Generator
+from contextlib import AbstractAsyncContextManager, contextmanager
+from typing import Any, Callable, Generic, Protocol, TypeVar, overload
+
+from starlette.types import Scope
+
+if sys.version_info >= (3, 13):  # pragma: no cover
+    from inspect import iscoroutinefunction
+    from typing import TypeIs
+else:  # pragma: no cover
+    from asyncio import iscoroutinefunction
+
+    from typing_extensions import TypeIs
+
+has_exceptiongroups = True
+if sys.version_info < (3, 11):  # pragma: no cover
+    try:
+        from exceptiongroup import BaseExceptionGroup  # type: ignore[unused-ignore,import-not-found]
+    except ImportError:
+        has_exceptiongroups = False
+
+T = TypeVar("T")
+AwaitableCallable = Callable[..., Awaitable[T]]
+
+
+@overload
+def is_async_callable(obj: AwaitableCallable[T]) -> TypeIs[AwaitableCallable[T]]: ...
+
+
+@overload
+def is_async_callable(obj: Any) -> TypeIs[AwaitableCallable[Any]]: ...
+
+
+def is_async_callable(obj: Any) -> Any:
+    while isinstance(obj, functools.partial):
+        obj = obj.func
+
+    return iscoroutinefunction(obj) or (callable(obj) and iscoroutinefunction(obj.__call__))
+
+
+T_co = TypeVar("T_co", covariant=True)
+
+
+class AwaitableOrContextManager(Awaitable[T_co], AbstractAsyncContextManager[T_co], Protocol[T_co]): ...
+
+
+class SupportsAsyncClose(Protocol):
+    async def close(self) -> None: ...  # pragma: no cover
+
+
+SupportsAsyncCloseType = TypeVar("SupportsAsyncCloseType", bound=SupportsAsyncClose, covariant=False)
+
+
+class AwaitableOrContextManagerWrapper(Generic[SupportsAsyncCloseType]):
+    __slots__ = ("aw", "entered")
+
+    def __init__(self, aw: Awaitable[SupportsAsyncCloseType]) -> None:
+        self.aw = aw
+
+    def __await__(self) -> Generator[Any, None, SupportsAsyncCloseType]:
+        return self.aw.__await__()
+
+    async def __aenter__(self) -> SupportsAsyncCloseType:
+        self.entered = await self.aw
+        return self.entered
+
+    async def __aexit__(self, *args: Any) -> None | bool:
+        await self.entered.close()
+        return None
+
+
+@contextmanager
+def collapse_excgroups() -> Generator[None, None, None]:
+    try:
+        yield
+    except BaseException as exc:
+        if has_exceptiongroups:  # pragma: no cover
+            while isinstance(exc, BaseExceptionGroup) and len(exc.exceptions) == 1:
+                exc = exc.exceptions[0]
+
+        raise exc
+
+
+def get_route_path(scope: Scope) -> str:
+    path: str = scope["path"]
+    root_path = scope.get("root_path", "")
+    if not root_path:
+        return path
+
+    if not path.startswith(root_path):
+        return path
+
+    if path == root_path:
+        return ""
+
+    if path[len(root_path)] == "/":
+        return path[len(root_path) :]
+
+    return path