Simplify battery management: bulk add, device-level auto-install, mass operations
- Replace single-battery add form with bulk add (brand + count, auto-generated labels)
- Add device-level install form: specify brand+qty pairs, system autoselects available batteries
- Add bulk actions on dashboard: retire, delete, unassign, change brand (checkbox multi-select)
- Keep per-battery assign route for special cases (e.g. known low-capacity battery)
- Remove unique constraint on Battery.label (labels are now auto-generated)
- Add *.snapshot to .gitignore for DB snapshot files
- Rewrite tests: 35 passing (11 new tests for bulk-add, device-install, bulk-actions)
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
iterminate
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