feat(do-not-disturb): add DND schedule feature with capabilities-driven UI

apps/mobile_app/lib/navigation/app_router.dart

@@ -190,6 +190,11 @@ void configureAppRouter() {
                     name: 'volume_control',
                     pageBuilder: const VolumeControlBuilder().buildPage,
                   ),
+                  GoRoute(
+                    path: 'do_not_disturb',
+                    name: 'do_not_disturb',
+                    pageBuilder: const DoNotDisturbBuilder().buildPage,
+                  ),
                   GoRoute(
                     path: 'call_history',
                     name: 'call_history',