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/onnxruntime/tools/logger.py

@@ -0,0 +1,11 @@
+# Copyright (c) Microsoft Corporation. All rights reserved.
+# Licensed under the MIT License.
+
+import logging
+
+
+def get_logger(name, level=logging.DEBUG):
+    logging.basicConfig(format="%(asctime)s %(name)s [%(levelname)s] - %(message)s")
+    logger = logging.getLogger(name)
+    logger.setLevel(level)
+    return logger