feat: Add TripImageService for automatic trip image management

- Implemented TripImageService to load missing images for trips, reload images, and clean up unused images.
- Added functionality to get image statistics and clean up duplicate images.
- Created utility scripts for manual image cleanup and diagnostics in Firebase Storage.
- Introduced tests for image loading optimization and photo quality algorithms.
- Updated dependencies in pubspec.yaml and pubspec.lock for image handling.

pubspec.yaml

@@ -57,6 +57,7 @@ dependencies:
   url_launcher: ^6.3.2
   sign_in_with_apple: ^7.0.1
   sign_in_button: ^4.0.1
+  cached_network_image: ^3.3.1
 
 dev_dependencies:
   flutter_launcher_icons: ^0.13.1