Add edit_button and edit_delete_buttons macros to detail_cards.html.
All 7 entity detail pages now show an Edit button next to Delete when
authenticated. Each detail template struct receives a pre-computed
edit_url from the route handler.
Add image infrastructure, API, and detail page integration:
- EntityImage domain model with ImageRepository trait
- SQLite storage for images and thumbnails as BLOBs
- Image processing with data URL decoding and thumbnail generation
- REST API: upload, get, delete, thumbnail at /{entity_type}/{id}/image
- resolve_image_url helper for image fallback chains
- image-upload web component for direct upload on detail pages
- Image display with vignette overlay and lightbox viewer
- Template macros: image_thumbnail, readonly_image, lightbox_script
- All 7 detail pages updated with image thumbnails
- Brew images fall back to roast; cup images fall back to cafe then roast
- Delete handler macro extended with optional image cleanup
- Add detail page routes, templates, and view models for roasters, cafes,
and gear, following the existing pattern from bags/brews/cups
- Add map_with_legend_1 macro for single-country detail maps
- Redirect to detail page after entity creation instead of list page
- Check referer in create handlers to return list fragment only from data page
- Update bag delete button to use red background style
- Update datastar tests to include referer header for create assertions
