fix: all 5 high-severity bugs from codex review
- use sqlx migrate!() instead of broken split(';') — triggers now work
- seq via AUTOINCREMENT — no race conditions, monotonic ordering
- replace ?since= with ?after_seq= — cursor-based, no timestamp format issues
- replace all unwrap() with typed errors (404, 409, 400, 500)
- reply_to same-channel enforced in route handler
- add biome for frontend linting
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
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