Replace all mock data with real backend integration

- Add database tables for email configs, settings, and activity logs
- Create backend endpoints for dashboard stats, analytics, archives, email config, and settings
- Create frontend service layer (admin, archive, email, settings services)
- Update AdminDashboard to use real statistics and activity data
- Update AnalyticsPage to fetch real analytics from backend
- Update ArchivesPage with pagination and real archive operations
- Update EmailConfigPage to manage real SMTP config and templates
- Remove all mock data and replace with API calls throughout admin interface

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

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

backend/migrations/init.js

@@ -26,6 +26,57 @@ async function runMigrations() {
       console.log('⚠️  Please change this password immediately!');
     }
     
+    // Create default email templates if none exist
+    const templateExists = await db('email_templates').first();
+    if (!templateExists) {
+      await db('email_templates').insert([
+        {
+          template_key: 'gallery_created',
+          subject: 'Your Photo Gallery is Ready!',
+          body_html: `<h2>Gallery Created Successfully</h2>
+<p>Dear {{host_name}},</p>
+<p>Your photo gallery "{{event_name}}" has been created successfully!</p>
+<p><strong>Gallery Details:</strong></p>
+<ul>
+  <li>Event Date: {{event_date}}</li>
+  <li>Gallery Link: {{gallery_link}}</li>
+  <li>Password: {{gallery_password}}</li>
+  <li>Expires: {{expiry_date}}</li>
+</ul>
+<p>Share this link and password with your guests to allow them to view and download photos.</p>`,
+          body_text: 'Gallery Created Successfully\n\nDear {{host_name}},\n\nYour photo gallery "{{event_name}}" has been created successfully!',
+          variables: JSON.stringify(['host_name', 'event_name', 'event_date', 'gallery_link', 'gallery_password', 'expiry_date'])
+        },
+        {
+          template_key: 'expiration_warning',
+          subject: 'Your Photo Gallery Expires Soon',
+          body_html: `<h2>Gallery Expiring Soon</h2>
+<p>Dear {{host_name}},</p>
+<p>Your photo gallery "{{event_name}}" will expire in {{days_remaining}} days.</p>
+<p>After expiration, the gallery will be archived and no longer accessible to guests.</p>
+<p><a href="{{gallery_link}}">Visit Gallery</a></p>`,
+          body_text: 'Gallery Expiring Soon\n\nDear {{host_name}},\n\nYour photo gallery "{{event_name}}" will expire in {{days_remaining}} days.',
+          variables: JSON.stringify(['host_name', 'event_name', 'days_remaining', 'gallery_link'])
+        }
+      ]);
+      console.log('Default email templates created');
+    }
+
+    // Create default email config if none exists
+    const emailConfig = await db('email_configs').first();
+    if (!emailConfig) {
+      await db('email_configs').insert({
+        smtp_host: process.env.SMTP_HOST || 'mailhog',
+        smtp_port: process.env.SMTP_PORT || 1025,
+        smtp_secure: process.env.SMTP_SECURE === 'true',
+        smtp_user: process.env.SMTP_USER || '',
+        smtp_pass: process.env.SMTP_PASS || '',
+        from_email: process.env.EMAIL_FROM || 'noreply@photo-sharing.local',
+        from_name: 'Photo Sharing'
+      });
+      console.log('Default email configuration created');
+    }
+
     console.log('Migrations completed successfully');
     process.exit(0);
   } catch (error) {