Fix brand theme application and add comprehensive translations

- Fixed theme not being reflected on gallery and admin login pages
- Created GlobalThemeProvider to apply themes globally
- Updated gallery and admin login pages to use dynamic CSS variables
- Added complete translations for all admin sections in English and German:
  - Notifications management
  - Event view and creation
  - Photo upload functionality
  - Category management
  - Archive page view
  - Analytics dashboard
  - Branding and theme settings
  - System settings
  - CMS page management
  - Email configuration
- Fixed admin photo management display issues
- Fixed photo upload category assignment
- Added password reset functionality for galleries
- Improved error handling and user feedback

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

Co-Authored-By: Claude <[email protected]>

frontend/src/services/events.service.ts

@@ -80,6 +80,20 @@ export const eventsService = {
     await api.post(`/api/admin/events/${id}/archive`);
   },
 
+  // Bulk archive events (admin)
+  async bulkArchiveEvents(eventIds: number[]): Promise<{
+    message: string;
+    results: {
+      successful: Array<{ id: number; name: string }>;
+      failed: Array<{ id: number; name: string; error: string }>;
+    };
+  }> {
+    const response = await api.post('/api/admin/events/bulk-archive', {
+      eventIds,
+    });
+    return response.data;
+  },
+
   // Extend event expiration (admin)
   async extendExpiration(id: number, days: number): Promise<Event> {
     const response = await api.post<Event>(`/api/events/${id}/extend`, {
@@ -87,4 +101,16 @@ export const eventsService = {
     });
     return response.data;
   },
+
+  // Get event categories
+  async getEventCategories(eventId: number): Promise<Array<{ id: number; name: string; slug: string }>> {
+    const response = await api.get(`/api/admin/categories/event/${eventId}`);
+    return response.data || [];
+  },
+
+  // Reset event password
+  async resetPassword(eventId: number, sendEmail: boolean = true): Promise<{ message: string; newPassword: string; emailSent: boolean }> {
+    const response = await api.post(`/api/admin/events/${eventId}/reset-password`, { sendEmail });
+    return response.data;
+  },
 };