feat: frontend MVP — auth, timeline, upload, albums, admin, image viewer

Backend:
- user roles (DB + JWT + first-user-is-admin)
- volume-aware file resolver (multi-volume asset serving)
- directory scanner uses volume URI directly
- date-summary endpoint (capture date from EXIF)
- timeline ordered by capture date
- list endpoints: volumes, plugins, pipelines, library paths
- delete endpoints: volumes, library paths
- configurable upload body limit (MAX_UPLOAD_BYTES)

Frontend:
- auth: login/register, token refresh, role-based admin gate
- timeline: date-grouped grid, infinite scroll, date scrubber
- image viewer: fullscreen zoom/pan/pinch, metadata sidebar
- upload: drag-drop, sequential upload, progress tracking
- albums: create, add/remove photos, asset picker dialog
- admin: storage (import library), jobs (pagination, error details),
  plugins (list + toggle), pipelines, sidecars, duplicates
- multi-select mode with add-to-album action
- TanStack Query for all data fetching

k-photos-frontend/package.json

@@ -13,6 +13,7 @@
   },
   "dependencies": {
     "@base-ui/react": "^1.5.0",
+    "@tanstack/react-query": "^5.100.14",
     "axios": "^1.16.1",
     "class-variance-authority": "^0.7.1",
     "clsx": "^2.1.1",
@@ -28,6 +29,7 @@
     "react-day-picker": "^10.0.1",
     "react-dom": "19.2.4",
     "react-resizable-panels": "^4.11.2",
+    "react-zoom-pan-pinch": "^4.0.3",
     "recharts": "3.8.0",
     "shadcn": "^4.9.0",
     "sonner": "^2.0.7",