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/chromadb/cli/utils.py

@@ -0,0 +1,40 @@
+from typing import Any, Dict
+
+import os
+import yaml
+
+
+def set_log_file_path(
+    log_config_path: str, new_filename: str = "chroma.log"
+) -> Dict[str, Any]:
+    """This works with the standard log_config.yml file.
+    It will not work with custom log configs that may use different handlers"""
+    with open(f"{log_config_path}", "r") as file:
+        log_config = yaml.safe_load(file)
+    for handler in log_config["handlers"].values():
+        if handler.get("class") == "logging.handlers.RotatingFileHandler":
+            handler["filename"] = new_filename
+
+    return log_config
+
+
+def get_directory_size(directory: str) -> int:
+    """Get the size of a directory in bytes"""
+    total = 0
+    with os.scandir(directory) as it:
+        for entry in it:
+            if entry.is_file():
+                total += entry.stat().st_size
+            elif entry.is_dir():
+                total += get_directory_size(entry.path)
+    return total
+
+
+# https://stackoverflow.com/a/1094933
+def sizeof_fmt(num: int, suffix: str = "B") -> str:
+    n: float = float(num)
+    for unit in ("", "Ki", "Mi", "Gi", "Ti", "Pi", "Ei", "Zi"):
+        if abs(n) < 1024.0:
+            return f"{n:3.1f}{unit}{suffix}"
+        n /= 1024.0
+    return f"{n:.1f}Yi{suffix}"