Battery groups are now identified by a 3-element combination: brand, type,
and chemistry (NiMH, Li-ion, LiFePO4, etc.) instead of just brand and type.
Changes:
- Add chemistries table with default values
- Update battery_groups schema with chemistry_id foreign key
- Create /api/chemistries endpoint for CRUD operations
- Update UI components to display and select chemistry
- Update documentation (FSD.md, TSD.md)
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