Fix multiple production issues and add password change functionality

- Fixed frontend API URL configuration to use correct port 3002
- Fixed create event functionality by adding proper endpoint and fixing JSON parsing
- Fixed email settings save functionality by importing logActivity correctly
- Fixed admin settings save functionality by using api client instead of direct fetch
- Implemented password change functionality with modal and backend endpoint
- Added updated_at column to admin_users table
- Fixed all mock data issues - now using real backend data throughout

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

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

backend/src/database/db.js

@@ -92,8 +92,17 @@ async function initializeDatabase() {
       table.string('password_hash').notNullable();
       table.boolean('is_active').defaultTo(true);
       table.datetime('created_at').defaultTo(db.fn.now());
+      table.datetime('updated_at').defaultTo(db.fn.now());
       table.datetime('last_login');
     });
+  } else {
+    // Check if updated_at column exists
+    const hasUpdatedAt = await db.schema.hasColumn('admin_users', 'updated_at');
+    if (!hasUpdatedAt) {
+      await db.schema.table('admin_users', (table) => {
+        table.datetime('updated_at').defaultTo(db.fn.now());
+      });
+    }
   }
 
   // Email configuration table