feat(flutter): 应用克莱因蓝主题与印尼语适配

lib/core/formatting/localized_date_time.dart

@@ -0,0 +1,15 @@
+// Author: fruit.com.cn
+
+import 'package:flutter/material.dart';
+
+/// Formats a timestamp with the active Material locale and 12/24-hour setting.
+String formatLocalizedDateTime(BuildContext context, DateTime value) {
+  final localizations = MaterialLocalizations.of(context);
+  final local = value.toLocal();
+  final date = localizations.formatCompactDate(local);
+  final time = localizations.formatTimeOfDay(
+    TimeOfDay.fromDateTime(local),
+    alwaysUse24HourFormat: MediaQuery.alwaysUse24HourFormatOf(context),
+  );
+  return '$date $time';
+}