feat: 实现日历提醒完整功能（操作执行、通知服务重构、归档）

- 新增 ReminderActionExecutor 处理取消/稍后提醒操作
- 新增 ReminderOutboxStore 本地存储待处理操作
- 重构 LocalNotificationService 支持聚合提醒和交互操作
- 新增 event_color_resolver 工具类统一颜色解析
- 新增 CalendarService.archiveEvent 归档方法
- 增强 ModelTracking 支持缓存命中、推理token和成本追踪
- 添加 qwen3.5-35b-a3b 模型配置
- 更新 AndroidManifest 全屏intent权限
- 补充相关单元测试和文档

apps/test/features/calendar/reminders/reminder_overlap_policy_test.dart

@@ -0,0 +1,48 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:social_app/features/calendar/data/models/schedule_item_model.dart';
+import 'package:social_app/features/calendar/reminders/reminder_overlap_policy.dart';
+
+void main() {
+  final policy = ReminderOverlapPolicy();
+
+  test('groups reminders in same minute bucket', () {
+    final now = DateTime(2026, 3, 18, 15, 40, 0);
+    final eventA = ScheduleItemModel(
+      id: 'a',
+      ownerId: 'u1',
+      title: 'A',
+      startAt: DateTime(2026, 3, 18, 16, 0, 0),
+      endAt: DateTime(2026, 3, 18, 17, 0, 0),
+      metadata: ScheduleMetadata(reminderMinutes: 15),
+    );
+    final eventB = ScheduleItemModel(
+      id: 'b',
+      ownerId: 'u1',
+      title: 'B',
+      startAt: DateTime(2026, 3, 18, 16, 0, 20),
+      endAt: DateTime(2026, 3, 18, 17, 0, 0),
+      metadata: ScheduleMetadata(reminderMinutes: 15),
+    );
+
+    final groups = policy.groupByMinute([eventA, eventB], now: now);
+    expect(groups.length, 1);
+    expect(groups.first.events.length, 2);
+    expect(groups.first.isAggregate, isTrue);
+  });
+
+  test('returns compensation fire time when remindAt already passed', () {
+    final now = DateTime(2026, 3, 18, 15, 50, 0);
+    final event = ScheduleItemModel(
+      id: 'a',
+      ownerId: 'u1',
+      title: 'A',
+      startAt: DateTime(2026, 3, 18, 16, 0, 0),
+      endAt: DateTime(2026, 3, 18, 16, 30, 0),
+      metadata: ScheduleMetadata(reminderMinutes: 15),
+    );
+
+    final fireAt = policy.resolveFirstFireAt(event, now: now);
+    expect(fireAt, isNotNull);
+    expect(fireAt!.isAfter(now), isTrue);
+  });
+}