Improve Weixin bridge error handling

fix: align permission button card structure with CodePilot's working implementation

fix: convert HTML to Feishu markdown in permission card

feat: Feishu V2 streaming cards, tool progress, permission buttons

fix: route numeric permission shortcuts outside session lock to avoid deadlock

fix: normalize numeric shortcut input for Feishu/QQ permission replies

feat: numeric shortcut permission replies (1/2/3) for Feishu/QQ

fix: build dist output for Node16 ESM consumers

fix: add HTTP timeouts to QQ API calls and replace fake tests with real code paths

fix: QQ send exception handling, image failure tracking, test timer leak

feat: add QQ bridge core MVP (C2C private chat)

docs: add Chinese translations for README and development guide

docs: add README, development guide, and MIT license

feat: initial extraction of Claude-to-IM bridge as standalone project