make data export a bool config setting

views/settings.html

@@ -257,6 +257,7 @@
         @endif
 
       </div>
+      @if(enable_data_export)
       <h2>{{ t('settings.export_data_title') || 'Export Data' }}</h2>
       <div class="export-settings-wrapper" style="background: rgba(0,0,0,0.1); padding: 20px; border-radius: 4px; border: 1px solid var(--nav-border-color); margin-bottom: 30px;">
         <p>{{ t('settings.export_data_desc') || 'Download a copy of your data. This process happens entirely in your browser to protect your privacy and save server resources.' }}</p>
@@ -295,6 +296,7 @@
           <i class="fa-solid fa-download" style="margin-right: 5px;"></i> {{ t('settings.start_export') || 'Generate Export (ZIP)' }}
         </button>
       </div>
+      @endif
 
       <h2>{{ t('settings.account') }}</h2>
       <div class="account-settings-wrapper"