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/openai/pagination.py

@@ -0,0 +1,190 @@
+# File generated from our OpenAPI spec by Stainless. See CONTRIBUTING.md for details.
+
+from typing import Any, List, Generic, TypeVar, Optional, cast
+from typing_extensions import Protocol, override, runtime_checkable
+
+from ._base_client import BasePage, PageInfo, BaseSyncPage, BaseAsyncPage
+
+__all__ = [
+    "SyncPage",
+    "AsyncPage",
+    "SyncCursorPage",
+    "AsyncCursorPage",
+    "SyncConversationCursorPage",
+    "AsyncConversationCursorPage",
+]
+
+_T = TypeVar("_T")
+
+
+@runtime_checkable
+class CursorPageItem(Protocol):
+    id: Optional[str]
+
+
+class SyncPage(BaseSyncPage[_T], BasePage[_T], Generic[_T]):
+    """Note: no pagination actually occurs yet, this is for forwards-compatibility."""
+
+    data: List[_T]
+    object: str
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def next_page_info(self) -> None:
+        """
+        This page represents a response that isn't actually paginated at the API level
+        so there will never be a next page.
+        """
+        return None
+
+
+class AsyncPage(BaseAsyncPage[_T], BasePage[_T], Generic[_T]):
+    """Note: no pagination actually occurs yet, this is for forwards-compatibility."""
+
+    data: List[_T]
+    object: str
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def next_page_info(self) -> None:
+        """
+        This page represents a response that isn't actually paginated at the API level
+        so there will never be a next page.
+        """
+        return None
+
+
+class SyncCursorPage(BaseSyncPage[_T], BasePage[_T], Generic[_T]):
+    data: List[_T]
+    has_more: Optional[bool] = None
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def has_next_page(self) -> bool:
+        has_more = self.has_more
+        if has_more is not None and has_more is False:
+            return False
+
+        return super().has_next_page()
+
+    @override
+    def next_page_info(self) -> Optional[PageInfo]:
+        data = self.data
+        if not data:
+            return None
+
+        item = cast(Any, data[-1])
+        if not isinstance(item, CursorPageItem) or item.id is None:
+            # TODO emit warning log
+            return None
+
+        return PageInfo(params={"after": item.id})
+
+
+class AsyncCursorPage(BaseAsyncPage[_T], BasePage[_T], Generic[_T]):
+    data: List[_T]
+    has_more: Optional[bool] = None
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def has_next_page(self) -> bool:
+        has_more = self.has_more
+        if has_more is not None and has_more is False:
+            return False
+
+        return super().has_next_page()
+
+    @override
+    def next_page_info(self) -> Optional[PageInfo]:
+        data = self.data
+        if not data:
+            return None
+
+        item = cast(Any, data[-1])
+        if not isinstance(item, CursorPageItem) or item.id is None:
+            # TODO emit warning log
+            return None
+
+        return PageInfo(params={"after": item.id})
+
+
+class SyncConversationCursorPage(BaseSyncPage[_T], BasePage[_T], Generic[_T]):
+    data: List[_T]
+    has_more: Optional[bool] = None
+    last_id: Optional[str] = None
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def has_next_page(self) -> bool:
+        has_more = self.has_more
+        if has_more is not None and has_more is False:
+            return False
+
+        return super().has_next_page()
+
+    @override
+    def next_page_info(self) -> Optional[PageInfo]:
+        last_id = self.last_id
+        if not last_id:
+            return None
+
+        return PageInfo(params={"after": last_id})
+
+
+class AsyncConversationCursorPage(BaseAsyncPage[_T], BasePage[_T], Generic[_T]):
+    data: List[_T]
+    has_more: Optional[bool] = None
+    last_id: Optional[str] = None
+
+    @override
+    def _get_page_items(self) -> List[_T]:
+        data = self.data
+        if not data:
+            return []
+        return data
+
+    @override
+    def has_next_page(self) -> bool:
+        has_more = self.has_more
+        if has_more is not None and has_more is False:
+            return False
+
+        return super().has_next_page()
+
+    @override
+    def next_page_info(self) -> Optional[PageInfo]:
+        last_id = self.last_id
+        if not last_id:
+            return None
+
+        return PageInfo(params={"after": last_id})