feat: Feed cooling, group key rotation, admin groups/quip repair, bulk block, health endpoints
- video_processor: upload extracted frames to R2, return signed URLs
- feed_algorithm: cooling period (0.2x multiplier) + 60/20/20 diversity injection + record impressions
- groups_handler: group feed, E2EE key-status/distribute/public-keys, invite/remove member, settings
- admin_handler: groups CRUD, quip repair (FFmpeg to R2), feed scores viewer
- user_handler: BulkBlockUsers POST /users/me/blocks/bulk
- main.go: wire health check (/health/detailed /ready /live) + all new routes
- monitoring: fix pre-existing zerolog import + uint64 type errors
- migration: user_feed_impressions, group_member_keys, groups key columns
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
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