Store extruder and bed temperatures as min/max ranges instead of
single values for more accurate filament specifications.
Backend changes:
- Add 4 new columns: settings_extruder_temp_min/max, settings_bed_temp_min/max
- Keep old columns for backward compatibility (marked deprecated)
- Alembic migration copies existing values to both min and max
- Update Pydantic models and API endpoints
Frontend changes:
- Filament model updated with new fields
- Create form uses min/max input pairs with Space.Compact
- Import from external DB populates both min and max with same value
- Label template updated to show ranges: "ET: 190-220 °C"
- Template help includes new tags
Labels now display temperature ranges like "190-220°C" which is more
useful for printing than a single recommended value.
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
