Enhance email templates with clickable links, branding, and improved styling

- Add clickable gallery links in all email templates
- Include application logo in email header and footer (custom or PicPeak default)
- Redesign emails with professional styling matching gallery login page
  - Gray background with white content box
  - PicPeak green header with centered logo
  - Clean typography and proper spacing
  - Responsive design for mobile devices
  - Styled call-to-action buttons
  - Footer with branding and copyright
- Update email processor to fetch branding settings dynamically
- Use proper API URLs for logo images in emails

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

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

frontend/src/services/events.service.ts

@@ -27,6 +27,7 @@ interface UpdateEventData {
   is_active?: boolean;
   allow_user_uploads?: boolean;
   upload_category_id?: number | null;
+  hero_photo_id?: number | null;
 }
 
 interface EventsListResponse {
@@ -70,13 +71,13 @@ export const eventsService = {
 
   // Update event (admin)
   async updateEvent(id: number, data: UpdateEventData): Promise<Event> {
-    const response = await api.put<Event>(`/api/events/${id}`, data);
+    const response = await api.put<Event>(`/api/admin/events/${id}`, data);
     return response.data;
   },
 
   // Delete/deactivate event (admin)
   async deleteEvent(id: number): Promise<void> {
-    await api.delete(`/api/events/${id}`);
+    await api.delete(`/api/admin/events/${id}`);
   },
 
   // Force archive event (admin)