chore: add Git LFS support for media files and update build scripts

- Introduced .gitattributes to manage large media files with Git LFS for various formats including HEIC, MOV, and JPG.
- Added a new build script in package.json for preparing demo data.
- Enhanced logging in the PhotoGalleryBuilder to include storage provider information.
- Updated the LocalStorageProvider to use the correct type for file stats.
- Added multiple new media files to the project.

Signed-off-by: Innei <tukon479@gmail.com>

package.json

@@ -10,6 +10,7 @@
   },
   "scripts": {
     "build": "pnpm --filter @afilmory/ssr build",
+    "build:demo": "sh scripts/prepare-demo-data.sh && pnpm --filter web build",
     "build:manifest": "pnpm --filter @afilmory/builder cli",
     "build:update-remote-repo": "sh scripts/build-update-remote-repo.sh",
     "create:doc": "tsx scripts/create-doc.ts",
@@ -69,4 +70,4 @@
       "pnpm update:lastmodified"
     ]
   }
-}
+}