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/mcp/shared/progress.py

@@ -0,0 +1,58 @@
+from collections.abc import Generator
+from contextlib import contextmanager
+from dataclasses import dataclass, field
+from typing import Generic
+
+from pydantic import BaseModel
+
+from mcp.shared.context import LifespanContextT, RequestContext
+from mcp.shared.session import (
+    BaseSession,
+    ReceiveNotificationT,
+    ReceiveRequestT,
+    SendNotificationT,
+    SendRequestT,
+    SendResultT,
+)
+from mcp.types import ProgressToken
+
+
+class Progress(BaseModel):
+    progress: float
+    total: float | None
+
+
+@dataclass
+class ProgressContext(Generic[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT]):
+    session: BaseSession[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT]
+    progress_token: ProgressToken
+    total: float | None
+    current: float = field(default=0.0, init=False)
+
+    async def progress(self, amount: float, message: str | None = None) -> None:
+        self.current += amount
+
+        await self.session.send_progress_notification(
+            self.progress_token, self.current, total=self.total, message=message
+        )
+
+
+@contextmanager
+def progress(
+    ctx: RequestContext[
+        BaseSession[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT],
+        LifespanContextT,
+    ],
+    total: float | None = None,
+) -> Generator[
+    ProgressContext[SendRequestT, SendNotificationT, SendResultT, ReceiveRequestT, ReceiveNotificationT],
+    None,
+]:
+    if ctx.meta is None or ctx.meta.progressToken is None:  # pragma: no cover
+        raise ValueError("No progress token provided")
+
+    progress_ctx = ProgressContext(ctx.session, ctx.meta.progressToken, total)
+    try:
+        yield progress_ctx
+    finally:
+        pass