Add Gemini-powered endpoints and frontend pages for proposing skincare
routines based on skin state, product compatibility, grooming schedule,
and recent history.
Backend (routines.py):
- POST /routines/suggest — single AM/PM routine for a date
- POST /routines/suggest-batch — AM+PM plan for up to 14 days
- Prompt context: skin snapshot, grooming schedule, 7-day history,
filtered product list with effects/incompatibilities/context rules
- Respects retinoid frequency limits, acid/retinoid separation,
grooming-aware safe_after_shaving rules
Frontend:
- /routines/suggest page with tab switcher (single / batch)
- Single tab: date + AM/PM + optional notes → generate → preview → save
- Batch tab: date range + notes → collapsible day cards (AM+PM) → save all
- Loading spinner during Gemini calls; product names resolved from map
- "Zaproponuj rutynę AI" button added to routines list page
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
