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/opentelemetry_api-1.38.0.dist-info/METADATA

@@ -0,0 +1,44 @@
+Metadata-Version: 2.4
+Name: opentelemetry-api
+Version: 1.38.0
+Summary: OpenTelemetry Python API
+Project-URL: Homepage, https://github.com/open-telemetry/opentelemetry-python/tree/main/opentelemetry-api
+Project-URL: Repository, https://github.com/open-telemetry/opentelemetry-python
+Author-email: OpenTelemetry Authors <cncf-opentelemetry-contributors@lists.cncf.io>
+License-Expression: Apache-2.0
+License-File: LICENSE
+Classifier: Development Status :: 5 - Production/Stable
+Classifier: Framework :: OpenTelemetry
+Classifier: Intended Audience :: Developers
+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: Typing :: Typed
+Requires-Python: >=3.9
+Requires-Dist: importlib-metadata<8.8.0,>=6.0
+Requires-Dist: typing-extensions>=4.5.0
+Description-Content-Type: text/x-rst
+
+OpenTelemetry Python API
+============================================================================
+
+|pypi|
+
+.. |pypi| image:: https://badge.fury.io/py/opentelemetry-api.svg
+   :target: https://pypi.org/project/opentelemetry-api/
+
+Installation
+------------
+
+::
+
+    pip install opentelemetry-api
+
+References
+----------
+
+* `OpenTelemetry Project <https://opentelemetry.io/>`_