feat(admin): issue #146 — photo upload with sharp crop/optimization (restore old behavior)

- POST /api/upload: FormData, 10MB limit, sharp resize 800px inside + webp@80, saves to /app/uploads, returns /uploads/url
- GET /uploads/[...path]: serves files with Content-Type, path traversal protected
- compose: ./uploads mounted in tg_shop_admin
- Dockerfile: /app/uploads created + chown nextjs
- catalog-page: file input + thumbnail preview + remove for photoUrl/hiddenPhotoUrl
- Bot resolvePhotoSource already supports /uploads/ paths — no bot changes

docker-compose.yml

@@ -75,6 +75,7 @@ services:
       - WG_PRESHARED_KEY=${WG_PRESHARED_KEY}
     volumes:
       - ./db:/app/db
+      - ./uploads:/app/uploads
     deploy:
       resources:
         limits: