feat: 实现日历提醒 in-app fallback 机制及通知服务重构

docs/todo/calendar-reminder-migration-checklist.md

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+# Calendar Reminder Migration Checklist
+
+## Scope
+
+本清单用于跟踪提醒模块迁移后旧代码清理，字段固定为：文件路径、符号名、处理决策、责任人、状态。
+
+## Items
+
+| File | Symbol | Decision | Owner | Status | Notes |
+|---|---|---|---|---|---|
+| `apps/lib/features/calendar/reminders/models/reminder_action.dart` | `ReminderAction.cancel` | delete | agent | done | 枚举项删除，保留字符串兼容映射到 `archive` |
+| `apps/lib/features/calendar/reminders/models/reminder_action.dart` | `ReminderAction.timeout30s` | delete | agent | done | 枚举项删除，保留字符串兼容映射到 `snooze10m` |
+| `apps/lib/features/calendar/reminders/models/reminder_action.dart` | `ReminderAction.autoArchive` | delete | agent | done | 枚举项删除，保留字符串兼容映射到 `archive` |
+| `apps/lib/features/calendar/reminders/models/reminder_action.dart` | `ReminderAction.normalized` | delete | agent | done | canonical 枚举后不再需要 |
+| `apps/lib/core/notifications/local_notification_service.dart` | `_actionSnooze = 'snooze_10m'` | replace | agent | done | 统一为 `_actionSnooze = 'snooze10m'` |
+| `apps/lib/core/notifications/local_notification_service.dart` | `_iosCategoryId = 'calendar_reminder_actions_v1'` | replace | agent | done | 已升级为 `calendar_reminder_v2` |
+
+## Verification Commands
+
+```bash
+rg "calendar_reminder_actions_v1|ReminderAction\.cancel|_oldReminderEntry|_legacyReminderRoute" apps/lib apps/test
+rg "snooze_10m" apps/lib apps/test
+```
+
+Expected:
+- 第一条：no matches
+- 第二条：仅允许出现在兼容映射分支（若存在）