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 <noreply@anthropic.com>

backend/src/routes/adminNotifications.js

@@ -0,0 +1,109 @@
+const express = require('express');
+const { db, logActivity } = require('../database/db');
+const { adminAuth } = require('../middleware/auth');
+const router = express.Router();
+
+// Get notifications (unread activity logs)
+router.get('/', adminAuth, async (req, res) => {
+  try {
+    const { limit = 20, includeRead = false } = req.query;
+
+    let query = db('activity_logs')
+      .select(
+        'activity_logs.*',
+        'events.event_name'
+      )
+      .leftJoin('events', 'activity_logs.event_id', 'events.id')
+      .orderBy('activity_logs.created_at', 'desc')
+      .limit(parseInt(limit));
+    
+    // By default, only show unread notifications
+    if (includeRead !== 'true') {
+      query = query.whereNull('activity_logs.read_at');
+    }
+
+    const notifications = await query;
+
+    // Format notifications
+    const formattedNotifications = notifications.map(notification => ({
+      id: notification.id,
+      type: notification.activity_type,
+      actorType: notification.actor_type,
+      actorName: notification.actor_name,
+      eventName: notification.event_name,
+      eventId: notification.event_id,
+      metadata: notification.metadata ? JSON.parse(notification.metadata) : {},
+      createdAt: notification.created_at,
+      readAt: notification.read_at,
+      isRead: !!notification.read_at
+    }));
+
+    // Get unread count
+    const unreadCount = await db('activity_logs')
+      .whereNull('read_at')
+      .count('id as count')
+      .first();
+
+    res.json({
+      notifications: formattedNotifications,
+      unreadCount: unreadCount.count || 0
+    });
+  } catch (error) {
+    console.error('Notifications fetch error:', error);
+    res.status(500).json({ error: 'Failed to fetch notifications' });
+  }
+});
+
+// Mark notification as read
+router.put('/:id/read', adminAuth, async (req, res) => {
+  try {
+    const { id } = req.params;
+
+    await db('activity_logs')
+      .where('id', id)
+      .update({
+        read_at: new Date()
+      });
+
+    res.json({ message: 'Notification marked as read' });
+  } catch (error) {
+    console.error('Mark notification read error:', error);
+    res.status(500).json({ error: 'Failed to mark notification as read' });
+  }
+});
+
+// Mark all notifications as read
+router.put('/read-all', adminAuth, async (req, res) => {
+  try {
+    await db('activity_logs')
+      .whereNull('read_at')
+      .update({
+        read_at: new Date()
+      });
+
+    res.json({ message: 'All notifications marked as read' });
+  } catch (error) {
+    console.error('Mark all notifications read error:', error);
+    res.status(500).json({ error: 'Failed to mark all notifications as read' });
+  }
+});
+
+// Delete old notifications (older than 30 days and read)
+router.delete('/clear-old', adminAuth, async (req, res) => {
+  try {
+    const deletedCount = await db('activity_logs')
+      .whereNotNull('read_at')
+      .where('created_at', '<', db.raw("datetime('now', '-30 days')"))
+      .delete();
+
+    res.json({ 
+      message: 'Old notifications cleared',
+      deletedCount 
+    });
+  } catch (error) {
+    console.error('Clear old notifications error:', error);
+    res.status(500).json({ error: 'Failed to clear old notifications' });
+  }
+});
+
+module.exports = router;