fix(api): 修復時區 import 排序與未使用變數 lint 錯誤

- 修正 import 順序 (standard → third-party → local)
- 修復 datetime/timedelta 未定義錯誤
- 移除未使用的 imports

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

apps/api/src/services/executor.py

@@ -21,7 +21,6 @@ Supported Operations:
 import asyncio
 import time
 from dataclasses import dataclass
-from src.utils.timezone import now_taipei, now_taipei_iso
 from enum import Enum
 from pathlib import Path
 from typing import Any
@@ -32,6 +31,7 @@ from src.core.config import settings
 from src.db.base import get_db_context
 from src.db.models import AuditLog
 from src.models.approval import ApprovalRequest
+from src.utils.timezone import now_taipei
 
 logger = structlog.get_logger(__name__)
 

apps/api/src/services/notifications/base.py

@@ -12,11 +12,11 @@ Phase 6: leWOOOgo Output Plugins
 from abc import ABC, abstractmethod
 from dataclasses import dataclass, field
 from datetime import datetime
-
-from src.utils.timezone import now_taipei
 from enum import Enum
 from typing import Any
 
+from src.utils.timezone import now_taipei
+
 
 class NotificationStatus(str, Enum):
     """通知狀態"""

apps/api/src/services/openclaw.py

@@ -23,9 +23,9 @@ import json
 import random
 import re
 import time
-import httpx
+from datetime import datetime
 
-from src.utils.timezone import now_taipei_iso
+import httpx
 import structlog
 
 from src.core.config import settings
@@ -34,6 +34,7 @@ from src.models.ai import (
     OpenClawDecision,
 )
 from src.services.signoz_client import GoldMetrics, get_signoz_client
+from src.utils.timezone import now_taipei_iso
 
 logger = structlog.get_logger(__name__)