feat(entry): 新增本地 mock 数据层

entry/src/main/ets/data/repository/CheckinRepository.ets

@@ -0,0 +1,78 @@
+import { CheckinRecord, CheckinStatus, GroupMember, PersonalCheckinRecord } from '../../model/CheckinModels';
+import { mockDelay } from './MockUtil';
+
+/**
+ * 打卡数据仓库契约。
+ */
+export abstract class CheckinRepository {
+  abstract observeCheckin(): Promise<CheckinRecord>;
+  abstract submitCheckin(status: string): Promise<CheckinRecord>;
+}
+
+/**
+ * 本地 mock 实现：内存 seed，提交更新自身状态。
+ */
+export class FakeCheckinRepository extends CheckinRepository {
+  private record: CheckinRecord = FakeCheckinRepository.seed();
+
+  async observeCheckin(): Promise<CheckinRecord> {
+    await mockDelay(250);
+    return this.record;
+  }
+
+  async submitCheckin(status: string): Promise<CheckinRecord> {
+    await mockDelay(300);
+    this.record.checked = true;
+    this.record.status = status;
+    // 更新"我"（第一个成员）在小组成员列表里的状态
+    if (this.record.groupMembers.length > 0) {
+      const me = this.record.groupMembers[0];
+      me.checkedIn = true;
+      me.status = status;
+      me.checkinTime = '今天 09:12';
+    }
+    return this.record;
+  }
+
+  private static seed(): CheckinRecord {
+    const r = new CheckinRecord();
+    r.classDate = '2026-09-06';
+    r.weekday = '周日';
+    r.dayNum = '06';
+    r.checked = false;
+    r.status = '';
+    r.groupName = '进阶一组';
+    r.groupMembers = [
+      FakeCheckinRepository.member('u-1001', '张三', false, '', ''),
+      FakeCheckinRepository.member('u-1002', '李四', true, CheckinStatus.NORMAL, '今天 09:05'),
+      FakeCheckinRepository.member('u-1003', '王五', true, CheckinStatus.LATE, '今天 09:18'),
+      FakeCheckinRepository.member('u-1004', '赵六', false, '', ''),
+      FakeCheckinRepository.member('u-1005', '孙七', true, CheckinStatus.LEAVE, '今天 08:40')
+    ];
+    r.personalHistory = [
+      FakeCheckinRepository.history('h-1', '2026-08-30', CheckinStatus.NORMAL, '08:52'),
+      FakeCheckinRepository.history('h-2', '2026-08-23', CheckinStatus.LATE, '09:21'),
+      FakeCheckinRepository.history('h-3', '2026-08-16', CheckinStatus.ABSENT, '--')
+    ];
+    return r;
+  }
+
+  private static member(id: string, name: string, checkedIn: boolean, status: string, checkinTime: string): GroupMember {
+    const m = new GroupMember();
+    m.id = id;
+    m.name = name;
+    m.checkedIn = checkedIn;
+    m.status = status;
+    m.checkinTime = checkinTime;
+    return m;
+  }
+
+  private static history(id: string, date: string, status: string, time: string): PersonalCheckinRecord {
+    const h = new PersonalCheckinRecord();
+    h.id = id;
+    h.date = date;
+    h.status = status;
+    h.time = time;
+    return h;
+  }
+}