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/agentscope/_logging.py

@@ -0,0 +1,47 @@
+# -*- coding: utf-8 -*-
+"""The logger for agentscope."""
+
+import logging
+
+
+_DEFAULT_FORMAT = (
+    "%(asctime)s | %(levelname)-7s | "
+    "%(module)s:%(funcName)s:%(lineno)s - %(message)s"
+)
+
+logger = logging.getLogger("as")
+
+
+def setup_logger(
+    level: str,
+    filepath: str | None = None,
+) -> None:
+    """Set up the agentscope logger.
+
+    Args:
+        level (`str`):
+            The logging level, chosen from "INFO", "DEBUG", "WARNING",
+            "ERROR", "CRITICAL".
+        filepath (`str | None`, optional):
+            The filepath to save the logging output.
+    """
+    if level not in ["INFO", "DEBUG", "WARNING", "ERROR", "CRITICAL"]:
+        raise ValueError(
+            f"Invalid logging level: {level}. Must be one of "
+            f"'INFO', 'DEBUG', 'WARNING', 'ERROR', 'CRITICAL'.",
+        )
+    logger.handlers.clear()
+    logger.setLevel(level)
+    handler = logging.StreamHandler()
+    handler.setFormatter(logging.Formatter(_DEFAULT_FORMAT))
+    logger.addHandler(handler)
+
+    if filepath:
+        handler = logging.FileHandler(filepath)
+        handler.setFormatter(logging.Formatter(_DEFAULT_FORMAT))
+        logger.addHandler(handler)
+
+    logger.propagate = False
+
+
+setup_logger("INFO")