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

package.json

@@ -9,11 +9,15 @@
     "lint": "eslint"
   },
   "dependencies": {
+    "gray-matter": "^4.0.3",
+    "js-yaml": "^4.1.1",
     "next": "16.1.6",
     "react": "19.2.3",
-    "react-dom": "19.2.3"
+    "react-dom": "19.2.3",
+    "thumbhash": "^0.1.1"
   },
   "devDependencies": {
+    "@types/js-yaml": "^4.0.9",
     "@types/node": "^20",
     "@types/react": "^19",
     "@types/react-dom": "^19",