feat: Add comprehensive system enhancements

- Add version display above storage consumption in admin sidebar
- Fix storage consumption to stick to bottom of window using flexbox
- Add user upload settings to events (allow uploads, category selection)
- Enhance disk space tab to comprehensive system status view
- Add localized date formatting for German/English language support
- Remove quick actions from dashboard for cleaner interface
- Create user photo upload functionality for galleries
- Add database migration for user upload settings
- Update all TypeScript types and interfaces

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

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

backend/server.js

@@ -120,6 +120,7 @@ app.use('/api/events', eventRoutes);
 app.use('/api/gallery', galleryRoutes);
 app.use('/api/admin', adminRoutes);
 app.use('/api/admin/auth', adminAuthRoutes);
+app.use('/api/admin/system', require('./src/routes/adminSystem'));
 app.use('/api/public/settings', require('./src/routes/publicSettings'));
 app.use('/api/public', require('./src/routes/publicCMS'));
 app.use('/api/images', require('./src/routes/protectedImages'));