feat: photography features & image optimizations

- Hero carousel: gallery.yaml hero accepts single UUID or array, crossfade component
- Full-bleed single albums: subpages with 1 album skip grid, render photos directly
- EXIF on hover: camera/lens/focal length overlay on grid items (toggle via exifOnHover)
- Customizable grid: columns/gap/aspectRatio/layout (masonry|uniform) via gallery.yaml
- Per-subpage grid overrides: each subpage can override global grid config
- True masonry: per-image aspect ratios from EXIF dimensions
- next/image migration: homepage hero, album covers, grid thumbnails, about portrait
- ThumbHash blur placeholders and dominant color backgrounds
- Custom next/image loader via image proxy with width/quality params
- Lightbox fade-in transition with dominant color background
- Password-protected subpages, health check, rate limiting, OG images

Dockerfile

@@ -36,6 +36,6 @@ ENV PORT=3000
 ENV HOSTNAME="0.0.0.0"
 
 HEALTHCHECK --interval=30s --timeout=5s --start-period=10s --retries=3 \
-  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/ || exit 1
+  CMD wget --no-verbose --tries=1 --spider http://localhost:3000/api/health || exit 1
 
 CMD ["node", "server.js"]