feat(schedule): 待办提醒推送、行事历仅展示提醒与管理 API

单次提醒 worker 投递、local 时间写入校验、未来 7 天提醒列表与忽略/批量删除；行事历去掉事项重复展示。

Co-authored-by: Cursor <cursoragent@cursor.com>

src/types.ts

@@ -359,8 +359,25 @@ export type MindSpaceDigestSubscription = {
   attempts?: number;
 };
 
+export type MindSpaceScheduleReminder = {
+  id: string;
+  itemId: string;
+  itemTitle: string;
+  itemKind: 'task' | 'event';
+  itemTimezone: string;
+  itemStartAt?: number | null;
+  itemEndAt?: number | null;
+  remindAt: number;
+  offsetMinutes?: number | null;
+  channel: 'wechat' | 'in_app';
+  status: 'pending' | 'locked' | 'sent' | 'failed' | 'cancelled';
+  sentAt?: number | null;
+};
+
 export type MindSpaceSchedule = {
   todayTodoItems: MindSpaceScheduleItem[];
+  upcomingItems: MindSpaceScheduleItem[];
+  upcomingReminders: MindSpaceScheduleReminder[];
   digestSubscriptions: MindSpaceDigestSubscription[];
 };