Update developer info to Danielle Sapelli

- Added developer name in Settings → About
- Updated README with author information
- Added 'Built With' section crediting Flutter & Claude Code

🤖 Generated with Claude Code (https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

lib/features/settings/screens/settings_screen.dart

@@ -169,7 +169,11 @@ class _SettingsScreenState extends State<SettingsScreen> {
           ),
           const ListTile(
             title: Text('Developer'),
-            subtitle: Text('Built with ❤️ using Flutter'),
+            subtitle: Text('Danielle Sapelli'),
+          ),
+          const ListTile(
+            title: Text('Built With'),
+            subtitle: Text('❤️ using Flutter & Claude Code'),
           ),
           ListTile(
             title: const Text('Privacy Policy'),