CRITICAL FIX: prevent gallery pages redirecting to admin login

Users were being redirected from gallery pages to admin login due to
useLocalizedDate hook trying to fetch admin settings. Fixed by:

1. Added general_date_format to public settings endpoint
2. Created publicSettingsService for unauthenticated access
3. Updated useLocalizedDate to use public settings instead of admin
4. Fixed API interceptor to not redirect on public endpoint 401s
5. Added backups/ and test-archiver/ to .gitignore

This restores gallery access for all users.

🤖 Generated with [Claude Code](https://claude.ai/code)

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

.gitignore

@@ -48,6 +48,10 @@ coverage/
 *.tmp
 *.temp
 
+# Backup and test directories
+backups/
+test-archiver/
+
 # Keep directory structure
 !storage/events/active/.gitkeep
 !storage/events/archived/.gitkeep