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/chromadb/rate_limit/__init__.py

@@ -0,0 +1,36 @@
+from abc import abstractmethod
+from typing import Awaitable, Callable, TypeVar, Any
+from chromadb.config import Component, System
+
+T = TypeVar("T", bound=Callable[..., Any])
+A = TypeVar("A", bound=Awaitable[Any])
+
+
+class RateLimitEnforcer(Component):
+    """
+    Rate limit enforcer.
+
+    Implemented as a wrapper around server functions to block requests if rate limits are exceeded.
+    """
+
+    def __init__(self, system: System) -> None:
+        super().__init__(system)
+
+    @abstractmethod
+    def rate_limit(self, func: T) -> T:
+        pass
+
+
+class AsyncRateLimitEnforcer(Component):
+    """
+    Rate limit enforcer.
+
+    Implemented as a wrapper around async functions to block requests if rate limits are exceeded.
+    """
+
+    def __init__(self, system: System) -> None:
+        super().__init__(system)
+
+    @abstractmethod
+    def rate_limit(self, func: A) -> A:
+        pass

backend_service/venv/lib/python3.13/site-packages/chromadb/rate_limit/simple_rate_limit/__init__.py

@@ -0,0 +1,42 @@
+from overrides import override
+from typing import Any, Awaitable, Callable, TypeVar
+from functools import wraps
+
+from chromadb.rate_limit import RateLimitEnforcer
+from chromadb.config import System
+
+T = TypeVar("T", bound=Callable[..., Any])
+A = TypeVar("A", bound=Awaitable[Any])
+
+
+class SimpleRateLimitEnforcer(RateLimitEnforcer):
+    """
+    A naive implementation of a rate limit enforcer that allows all requests.
+    """
+
+    def __init__(self, system: System) -> None:
+        super().__init__(system)
+
+    @override
+    def rate_limit(self, func: T) -> T:
+        @wraps(func)
+        def wrapper(*args: Any, **kwargs: Any) -> Any:
+            return func(*args, **kwargs)
+
+        return wrapper  # type: ignore
+
+
+class SimpleAsyncRateLimitEnforcer(RateLimitEnforcer):
+    """
+    A naive implementation of a rate limit enforcer that allows all requests.
+    """
+
+    def __init__(self, system: System) -> None:
+        super().__init__(system)
+
+    @override
+    def rate_limit(self, func: A) -> A:
+        @wraps(func)
+        async def wrapper(*args: Any, **kwargs: Any) -> Any:
+            return await func(*args, **kwargs)
+        return wrapper  # type: ignore