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/pages/admin/SettingsPage.tsx

@@ -84,18 +84,12 @@ export const SettingsPage: React.FC = () => {
   // Save mutations
   const saveGeneralMutation = useMutation({
     mutationFn: async () => {
-      // Save each setting
-      const promises = Object.entries(generalSettings).map(([key, value]) => 
-        fetch('/api/admin/settings/general', {
-          method: 'PUT',
-          headers: {
-            'Content-Type': 'application/json',
-            'Authorization': `Bearer ${localStorage.getItem('adminToken')}`
-          },
-          body: JSON.stringify({ [`general_${key}`]: value })
-        })
-      );
-      await Promise.all(promises);
+      // Convert to the format expected by the API
+      const settingsData: Record<string, any> = {};
+      Object.entries(generalSettings).forEach(([key, value]) => {
+        settingsData[`general_${key}`] = value;
+      });
+      return settingsService.updateSettings(settingsData);
     },
     onSuccess: () => {
       toast.success('General settings saved successfully');
@@ -108,18 +102,12 @@ export const SettingsPage: React.FC = () => {
 
   const saveSecurityMutation = useMutation({
     mutationFn: async () => {
-      // Save each setting
-      const promises = Object.entries(securitySettings).map(([key, value]) => 
-        fetch('/api/admin/settings/security', {
-          method: 'PUT',
-          headers: {
-            'Content-Type': 'application/json',
-            'Authorization': `Bearer ${localStorage.getItem('adminToken')}`
-          },
-          body: JSON.stringify({ [`security_${key}`]: value })
-        })
-      );
-      await Promise.all(promises);
+      // Convert to the format expected by the API
+      const settingsData: Record<string, any> = {};
+      Object.entries(securitySettings).forEach(([key, value]) => {
+        settingsData[`security_${key}`] = value;
+      });
+      return settingsService.updateSettings(settingsData);
     },
     onSuccess: () => {
       toast.success('Security settings saved successfully');