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/bootstrap.py

@@ -11,7 +11,8 @@ A 类 Skill 由引擎确定性注入全文，不靠 Description 触发。
 
 import logging
 import os
-from typing import Any, List
+from pathlib import Path
+from typing import Any, Dict, List, Optional
 
 logger = logging.getLogger("moziplus-v2.bootstrap")