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/aioitertools-0.13.0.dist-info/METADATA

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+Metadata-Version: 2.4
+Name: aioitertools
+Version: 0.13.0
+Summary: itertools and builtins for AsyncIO and mixed iterables
+Author-email: Amethyst Reese <amethyst@n7.gg>
+Requires-Python: >=3.9
+Description-Content-Type: text/markdown
+License-Expression: MIT
+Classifier: Framework :: AsyncIO
+Classifier: Intended Audience :: Developers
+Classifier: Topic :: Software Development :: Libraries
+License-File: LICENSE
+Requires-Dist: typing_extensions>=4.0; python_version < '3.10'
+Project-URL: Changelog, https://aioitertools.omnilib.dev/en/latest/changelog.html
+Project-URL: Documentation, https://aioitertools.omnilib.dev
+Project-URL: Github, https://github.com/omnilib/aioitertools
+
+aioitertools
+============
+
+Implementation of itertools, builtins, and more for AsyncIO and mixed-type iterables.
+
+[![documentation](https://readthedocs.org/projects/aioitertools/badge/?version=latest)](https://aioitertools.omnilib.dev)
+[![version](https://img.shields.io/pypi/v/aioitertools.svg)](https://pypi.org/project/aioitertools)
+[![changelog](https://img.shields.io/badge/change-log-blue)](https://aioitertools.omnilib.dev/en/latest/changelog.html)
+[![license](https://img.shields.io/pypi/l/aioitertools.svg)](https://github.com/omnilib/aioitertools/blob/main/LICENSE)
+
+
+Install
+-------
+
+aioitertools requires Python 3.9 or newer.
+You can install it from PyPI:
+
+```sh
+$ pip install aioitertools
+```
+
+Usage
+-----
+
+aioitertools shadows the standard library whenever possible to provide
+asynchronous version of the modules and functions you already know.  It's
+fully compatible with standard iterators and async iterators alike, giving
+you one unified, familiar interface for interacting with iterable objects:
+
+```python
+from aioitertools import iter, next, map, zip
+
+something = iter(...)
+first_item = await next(something)
+
+async for item in iter(something):
+    ...
+
+
+async def fetch(url):
+    response = await aiohttp.request(...)
+    return response.json
+
+async for value in map(fetch, MANY_URLS):
+    ...
+
+
+async for a, b in zip(something, something_else):
+    ...
+```
+
+
+aioitertools emulates the entire `itertools` module, offering the same
+function signatures, but as async generators.  All functions support
+standard iterables and async iterables alike, and can take functions or
+coroutines:
+
+```python
+from aioitertools import chain, islice
+
+async def generator1(...):
+    yield ...
+
+async def generator2(...):
+    yield ...
+
+async for value in chain(generator1(), generator2()):
+    ...
+
+async for value in islice(generator1(), 2, None, 2):
+    ...
+```
+
+
+See [builtins.py][], [itertools.py][], and [more_itertools.py][] for full
+documentation of functions and abilities.
+
+
+License
+-------
+
+aioitertools is copyright [Amethyst Reese](https://noswap.com), and licensed under
+the MIT license.  I am providing code in this repository to you under an open
+source license.  This is my personal repository; the license you receive to
+my code is from me and not from my employer. See the `LICENSE` file for details.
+
+
+[builtins.py]: https://github.com/omnilib/aioitertools/blob/main/aioitertools/builtins.py
+[itertools.py]: https://github.com/omnilib/aioitertools/blob/main/aioitertools/itertools.py
+[more_itertools.py]: https://github.com/omnilib/aioitertools/blob/main/aioitertools/more_itertools.py
+