feat: flexible rest days system with JSONB config (v9d Phase 2a)
PROBLEM: Simple full_rest/active_recovery model doesn't support
context-specific rest days (e.g., strength rest but cardio allowed).
SOLUTION: JSONB-based flexible rest day configuration.
## Changes:
**Migration 010:**
- Refactor rest_days.type → rest_config JSONB
- Schema: {focus, rest_from[], allows[], intensity_max}
- Validation function with check constraint
- GIN index for performant JSONB queries
**Backend (routers/rest_days.py):**
- CRUD: list, create (upsert by date), get, update, delete
- Stats: count per week, focus distribution
- Validation: check activity conflicts with rest day config
**Frontend (api.js):**
- 7 new methods: listRestDays, createRestDay, updateRestDay,
deleteRestDay, getRestDaysStats, validateActivity
**Integration:**
- Router registered in main.py
- Ready for weekly planning validation rules
## Next Steps:
- Frontend UI (RestDaysPage with Quick/Custom mode)
- Activity conflict warnings
- Dashboard widget
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Lars
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