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>

frontend/src/services/admin.service.ts

@@ -91,5 +91,10 @@ export const adminService = {
     const sizes = ['Bytes', 'KB', 'MB', 'GB', 'TB'];
     const i = Math.floor(Math.log(bytes) / Math.log(k));
     return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
+  },
+
+  // Change password
+  async changePassword(data: { currentPassword: string; newPassword: string }): Promise<void> {
+    await api.post('/api/admin/auth/change-password', data);
   }
 };