fix: Add Audit Logs navigation to Admin Console settings (refs #10)

The routes and screen components for AdminLogsPage were implemented but
the navigation links to access them were missing from both desktop and
mobile Settings pages.

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

frontend/src/features/settings/mobile/MobileSettingsScreen.tsx

@@ -509,6 +509,14 @@ export const MobileSettingsScreen: React.FC = () => {
                   <div className="font-semibold">Backup & Restore</div>
                   <div className="text-sm text-primary-500 mt-1 dark:text-primary-400">Create backups and restore data</div>
                 </button>
+                <button
+                  onClick={() => navigateToScreen('AdminLogs')}
+                  className="w-full text-left p-4 bg-primary-50 text-primary-700 rounded-lg font-medium hover:bg-primary-100 transition-colors active:bg-primary-200 dark:bg-primary-900/20 dark:text-primary-300 dark:hover:bg-primary-900/30"
+                  style={{ minHeight: '44px' }}
+                >
+                  <div className="font-semibold">Audit Logs</div>
+                  <div className="text-sm text-primary-500 mt-1 dark:text-primary-400">View system activity and audit logs</div>
+                </button>
               </div>
             </div>
           </GlassCard>