Revert "[moz] fix(api): flake8 lint 修复 — 移除未使用 import"

This reverts commit c08b891c42.

src/api/shared.py

@@ -1,5 +1,6 @@
 """共享 helper 和常量"""
 
+from pathlib import Path
 from typing import Any, Dict
 from fastapi import HTTPException
 
@@ -55,8 +56,7 @@ def _init_agent_ids():
     if _KNOWN_AGENT_IDS:
         return
     try:
-        import yaml
-        import os
+        import yaml, os
         cfg_path = os.path.join(os.path.dirname(__file__), "..", "..", "config", "default.yaml")
         with open(cfg_path) as f:
             cfg = yaml.safe_load(f)

src/api/task_routes.py

@@ -19,6 +19,7 @@ from src.api.shared import (
     _bb,
     _q,
     _task_to_dict,
+    _validate_project,
     _extract_mentions,
 )