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 <[email protected]>

backend/src/routes/admin.js

@@ -1,12 +1,16 @@
 const express = require('express');
 const router = express.Router();
 
-// This route handles admin endpoints that are different from events
-// For now, just export an empty router as events.js handles most admin functionality
+// Import sub-routers
+const dashboardRoutes = require('./adminDashboard');
+const archiveRoutes = require('./adminArchives');
+const emailRoutes = require('./adminEmail');
+const settingsRoutes = require('./adminSettings');
 
-// Admin dashboard data could go here
-router.get('/dashboard', async (req, res) => {
-  res.json({ message: 'Admin dashboard endpoint' });
-});
+// Mount sub-routers
+router.use('/dashboard', dashboardRoutes);
+router.use('/archives', archiveRoutes);
+router.use('/email', emailRoutes);
+router.use('/settings', settingsRoutes);
 
 module.exports = router;