feat(reward): 新增客户端奖励中心

test/reward/reward_model_test.dart

@@ -0,0 +1,42 @@
+// Author: fruit.com.cn
+
+import 'package:flutter_test/flutter_test.dart';
+import 'package:fruitshorts/core/data/models/reward.dart';
+
+void main() {
+  test('should_parse_string_numbers_when_reward_overview_is_received', () {
+    final overview = RewardOverview.fromJson({
+      'serverDate': '2026-11-05',
+      'timezone': 'Asia/Jakarta',
+      'coinBalance': '135',
+      'checkin': {
+        'taskId': '9',
+        'checkedInToday': true,
+        'streak': 2,
+        'currentDay': 3,
+        'days': [
+          {'dayIndex': 1, 'rewardCoin': '35', 'checked': true},
+        ],
+      },
+      'sections': [
+        {
+          'code': 'DAILY',
+          'title': 'Tugas harian',
+          'tasks': [
+            {
+              'id': '18',
+              'targetValue': '300',
+              'progressValue': '120',
+              'rewardCoin': '20',
+              'status': 'IN_PROGRESS',
+            },
+          ],
+        },
+      ],
+    });
+
+    expect(overview.coinBalance, 135);
+    expect(overview.checkin.days.single.rewardCoin, 35);
+    expect(overview.sections.single.tasks.single.progress, 0.4);
+  });
+}