Tim Baek 599cd2eeeb feat: analytics backend API with chat_message table ...

- Add chat_message table for message-level analytics with usage JSON field
- Add migration to backfill from existing chats
- Add /analytics endpoints: summary, models, users, daily
- Support hourly/daily granularity for time-series data
- Fill missing days/hours in date range

2026-02-01 07:04:13 +04:00

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