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/cachetools-6.2.2.dist-info/METADATA

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+Metadata-Version: 2.4
+Name: cachetools
+Version: 6.2.2
+Summary: Extensible memoizing collections and decorators
+Home-page: https://github.com/tkem/cachetools/
+Author: Thomas Kemmer
+Author-email: tkemmer@computer.org
+License: MIT
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Environment :: Other Environment
+Classifier: Intended Audience :: Developers
+Classifier: License :: OSI Approved :: MIT License
+Classifier: Operating System :: OS Independent
+Classifier: Programming Language :: Python
+Classifier: Programming Language :: Python :: 3
+Classifier: Programming Language :: Python :: 3.9
+Classifier: Programming Language :: Python :: 3.10
+Classifier: Programming Language :: Python :: 3.11
+Classifier: Programming Language :: Python :: 3.12
+Classifier: Programming Language :: Python :: 3.13
+Classifier: Programming Language :: Python :: 3.14
+Classifier: Topic :: Software Development :: Libraries :: Python Modules
+Requires-Python: >=3.9
+License-File: LICENSE
+Dynamic: license-file
+
+cachetools
+========================================================================
+
+.. image:: https://img.shields.io/pypi/v/cachetools
+   :target: https://pypi.org/project/cachetools/
+   :alt: Latest PyPI version
+
+.. image:: https://img.shields.io/github/actions/workflow/status/tkem/cachetools/ci.yml
+   :target: https://github.com/tkem/cachetools/actions/workflows/ci.yml
+   :alt: CI build status
+
+.. image:: https://img.shields.io/readthedocs/cachetools
+   :target: https://cachetools.readthedocs.io/
+   :alt: Documentation build status
+
+.. image:: https://img.shields.io/codecov/c/github/tkem/cachetools/master.svg
+   :target: https://codecov.io/gh/tkem/cachetools
+   :alt: Test coverage
+
+.. image:: https://img.shields.io/librariesio/sourcerank/pypi/cachetools
+   :target: https://libraries.io/pypi/cachetools
+   :alt: Libraries.io SourceRank
+
+.. image:: https://img.shields.io/github/license/tkem/cachetools
+   :target: https://raw.github.com/tkem/cachetools/master/LICENSE
+   :alt: License
+
+.. image:: https://img.shields.io/badge/code%20style-black-000000.svg
+   :target: https://github.com/psf/black
+   :alt: Code style: black
+
+
+This module provides various memoizing collections and decorators,
+including variants of the Python Standard Library's `@lru_cache`_
+function decorator.
+
+.. code-block:: python
+
+   from cachetools import cached, LRUCache, TTLCache
+
+   # speed up calculating Fibonacci numbers with dynamic programming
+   @cached(cache={})
+   def fib(n):
+       return n if n < 2 else fib(n - 1) + fib(n - 2)
+
+   # cache least recently used Python Enhancement Proposals
+   @cached(cache=LRUCache(maxsize=32))
+   def get_pep(num):
+       url = 'http://www.python.org/dev/peps/pep-%04d/' % num
+       with urllib.request.urlopen(url) as s:
+           return s.read()
+
+   # cache weather data for no longer than ten minutes
+   @cached(cache=TTLCache(maxsize=1024, ttl=600))
+   def get_weather(place):
+       return owm.weather_at_place(place).get_weather()
+
+For the purpose of this module, a *cache* is a mutable_ mapping_ of a
+fixed maximum size.  When the cache is full, i.e. by adding another
+item the cache would exceed its maximum size, the cache must choose
+which item(s) to discard based on a suitable `cache algorithm`_.
+
+This module provides multiple cache classes based on different cache
+algorithms, as well as decorators for easily memoizing function and
+method calls.
+
+
+Installation
+------------------------------------------------------------------------
+
+cachetools is available from PyPI_ and can be installed by running::
+
+  pip install cachetools
+
+Typing stubs for this package are provided by typeshed_ and can be
+installed by running::
+
+  pip install types-cachetools
+
+
+Project Resources
+------------------------------------------------------------------------
+
+- `Documentation`_
+- `Issue tracker`_
+- `Source code`_
+- `Change log`_
+
+
+Related Projects
+------------------------------------------------------------------------
+
+- asyncache_: Helpers to use cachetools_ with asyncio.
+- cachetools-async_: Helpers to use cachetools_ with asyncio.
+- cacheing_: Pure Python Cacheing Library.
+- CacheToolsUtils_: Stackable cache classes for sharing, encryption,
+  statistics *and more* on top of cachetools_, redis_ and memcached_.
+- shelved-cache_: Persistent cache implementation for Python
+  cachetools_.
+
+
+License
+------------------------------------------------------------------------
+
+Copyright (c) 2014-2025 Thomas Kemmer.
+
+Licensed under the `MIT License`_.
+
+
+.. _@lru_cache: https://docs.python.org/3/library/functools.html#functools.lru_cache
+.. _mutable: https://docs.python.org/dev/glossary.html#term-mutable
+.. _mapping: https://docs.python.org/dev/glossary.html#term-mapping
+.. _cache algorithm: https://en.wikipedia.org/wiki/Cache_algorithms
+
+.. _PyPI: https://pypi.org/project/cachetools/
+.. _typeshed: https://github.com/python/typeshed/
+.. _Documentation: https://cachetools.readthedocs.io/
+.. _Issue tracker: https://github.com/tkem/cachetools/issues/
+.. _Source code: https://github.com/tkem/cachetools/
+.. _Change log: https://github.com/tkem/cachetools/blob/master/CHANGELOG.rst
+.. _MIT License: https://raw.github.com/tkem/cachetools/master/LICENSE
+
+.. _asyncache: https://pypi.org/project/asyncache/
+.. _cachetools-async: https://pypi.org/project/cachetools-async/
+.. _cacheing: https://pypi.org/project/cacheing/
+.. _CacheToolsUtils: https://pypi.org/project/CacheToolsUtils/
+.. _shelved-cache: https://pypi.org/project/shelved-cache/
+.. _cachetools: https://pypi.org/project/cachetools/
+.. _redis: https://redis.io/
+.. _memcached: https://memcached.org/