Batch 8: Blacklist + FileTree + resource management

[JusterZhu]

Batch 8: Blacklist, FileTree, and Resource Management

Tasks

1. IBlackListMatcher instance-based — Replace global BlackListManager singleton with injectable matcher
2. FileTreeEnumerator — New file enumeration with blacklist filtering
3. CancellationToken贯穿 — Propagate tokens through all async methods
4. Cancel() method — GeneralUpdateBootstrap cancellation support

Related

• Refactor plan: GeneralUpdate-refactor-plan.md