feat: implement bidirectional AST mapping, SQLite WAL tuning, Focus Mode, and integrations

[mcocdaa]

Implements MeetFlow P0/P1 whitepaper tasks:

• Bidirectional Markdown AST state machine
• SQLite WAL deep tuning (64MB cache, 256MB mmap, busy timeout)
• Meeting Focus Mode UI and micro-interactions
• RFC 5545 iCalendar feed, outbound webhooks, and Ollama integration

[coderabbitai]

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