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/src/database/db.js

@@ -95,6 +95,79 @@ async function initializeDatabase() {
       table.datetime('last_login');
     });
   }
+
+  // Email configuration table
+  const hasEmailConfigTable = await db.schema.hasTable('email_configs');
+  if (!hasEmailConfigTable) {
+    await db.schema.createTable('email_configs', (table) => {
+      table.increments('id').primary();
+      table.string('smtp_host').notNullable();
+      table.integer('smtp_port').notNullable();
+      table.boolean('smtp_secure').defaultTo(false);
+      table.string('smtp_user');
+      table.string('smtp_pass');
+      table.string('from_email').notNullable();
+      table.string('from_name');
+      table.datetime('updated_at').defaultTo(db.fn.now());
+    });
+  }
+
+  // Email templates table
+  const hasEmailTemplatesTable = await db.schema.hasTable('email_templates');
+  if (!hasEmailTemplatesTable) {
+    await db.schema.createTable('email_templates', (table) => {
+      table.increments('id').primary();
+      table.string('template_key').unique().notNullable(); // 'gallery_created', 'expiration_warning', etc.
+      table.string('subject').notNullable();
+      table.text('body_html').notNullable();
+      table.text('body_text');
+      table.json('variables'); // Available template variables
+      table.datetime('updated_at').defaultTo(db.fn.now());
+    });
+  }
+
+  // App settings table
+  const hasAppSettingsTable = await db.schema.hasTable('app_settings');
+  if (!hasAppSettingsTable) {
+    await db.schema.createTable('app_settings', (table) => {
+      table.increments('id').primary();
+      table.string('setting_key').unique().notNullable();
+      table.json('setting_value');
+      table.string('setting_type'); // 'branding', 'theme', 'general'
+      table.datetime('updated_at').defaultTo(db.fn.now());
+    });
+  }
+
+  // Activity logs table
+  const hasActivityLogsTable = await db.schema.hasTable('activity_logs');
+  if (!hasActivityLogsTable) {
+    await db.schema.createTable('activity_logs', (table) => {
+      table.increments('id').primary();
+      table.string('activity_type').notNullable(); // 'event_created', 'photos_uploaded', etc.
+      table.string('actor_type'); // 'admin', 'system', 'guest'
+      table.integer('actor_id');
+      table.string('actor_name');
+      table.json('metadata'); // Additional data about the activity
+      table.integer('event_id').references('id').inTable('events');
+      table.datetime('created_at').defaultTo(db.fn.now());
+    });
+  }
 }
 
-module.exports = { db, initializeDatabase };
+// Helper function to log activities
+async function logActivity(activityType, metadata = {}, eventId = null, actor = null) {
+  try {
+    await db('activity_logs').insert({
+      activity_type: activityType,
+      actor_type: actor?.type || 'system',
+      actor_id: actor?.id || null,
+      actor_name: actor?.name || null,
+      metadata: JSON.stringify(metadata),
+      event_id: eventId
+    });
+  } catch (error) {
+    console.error('Failed to log activity:', error);
+  }
+}
+
+module.exports = { db, initializeDatabase, logActivity };