🤖 Feishu: expand channel support

What:
- add post parsing, doc link extraction, routing, replies, reactions, typing, and user lookup
- fix media download/send flows and make doc fetches domain-aware
- update Feishu docs and clawtributor credits

Why:
- raise Feishu parity with other channels and avoid dropped group messages
- keep replies threaded while supporting Lark domains
- document new configuration and credit the contributor

Tests:
- pnpm build
- pnpm check
- pnpm test (gateway suite timed out; reran pnpm vitest run --config vitest.gateway.config.ts)

Co-authored-by: 九灵云 <server@jiulingyun.cn>

docs/start/hubs.md

@@ -17,6 +17,7 @@ Use these hubs to discover every page, including deep dives and reference docs t
 
 - [Index](/)
 - [Getting Started](/start/getting-started)
+- [Quick start](/start/quickstart)
 - [Onboarding](/start/onboarding)
 - [Wizard](/start/wizard)
 - [Setup](/start/setup)