chore: simayi-approved changes - lint fixes, toolchain improvements, healthz

All changes reviewed and APPROVED in PR #12 (Review ID: 40):
- toolchain_routes: webhook repo/org format compat, content dedup (sha256), closed issue filter
- dispatcher: inform mail crash 误标 done 修复
- ticker: cleanup and improvements
- healthz endpoint
- conftest: integration/e2e deselect markers
- docs: design docs, test-guide updates
- various lint/whitespace fixes across 30 files

src/daemon/skill_system.py

@@ -10,11 +10,12 @@ from __future__ import annotations
 
 import json
 import logging
+import re
 from dataclasses import dataclass, field
 from datetime import datetime
 from enum import Enum
 from pathlib import Path
-from typing import Any, Dict, List, Optional, Tuple
+from typing import Any, Callable, Dict, List, Optional, Tuple
 
 logger = logging.getLogger("moziplus-v2.skill")