```

feat(AI): 集成MNN推理引擎替换MLX作为主AI运行时

- 引入MNN(alibaba) + Arm SME2 + CPU作为主AI运行时，支持A19/iPhone17的
  SME2和A17的NEON加速
- 添加MLX Swift作为兜底GPU推理方案，实现双后端切换机制
- 使用单一Qwen3.5-2B多模态模型(1.2GB)，替代原有的LLM+VL分离架构
- 实现InferenceEngine.current引擎选择逻辑，真机默认MNN，模拟器回退MLX
- 更新AIAgent架构，通过MNNLLMBridge(ObjC++) → MNNBackend进行推理
- 修改队列机制防止并发推理导致OOM，使用信号量闸门控制显存占用
- 更新文档中的技术栈说明、模块边界和周次交付计划
```

康康/Services/ReminderService.swift

@@ -80,20 +80,24 @@ enum ReminderService {
         let title = reminder.title.trimmingCharacters(in: .whitespacesAndNewlines)
         let body = reminder.note.trimmingCharacters(in: .whitespacesAndNewlines)
         let h = reminder.hour, m = reminder.minute
-        let slots: [Slot]
-        switch reminder.frequency {
-        case .daily:
-            slots = [Slot(suffix: "daily", dc: DateComponents(hour: h, minute: m))]
-        case .weekly:
-            slots = reminder.weekdays.map { wd in
-                Slot(suffix: "w\(wd)", dc: DateComponents(hour: h, minute: m, weekday: wd))
+        // 多选频率:把每个选中频率展开成槽,合并调度(suffix 各不冲突,可单独取消)。
+        var slots: [Slot] = []
+        for f in reminder.frequencies {
+            switch f {
+            case .daily:
+                slots.append(Slot(suffix: "daily", dc: DateComponents(hour: h, minute: m)))
+            case .weekly:
+                slots += reminder.weekdays.map { wd in
+                    Slot(suffix: "w\(wd)", dc: DateComponents(hour: h, minute: m, weekday: wd))
+                }
+            case .monthly:
+                slots += reminder.monthlyDays.map { d in
+                    Slot(suffix: "m\(d)", dc: DateComponents(day: d, hour: h, minute: m))
+                }
+            case .yearly:
+                slots.append(Slot(suffix: "yearly",
+                                  dc: DateComponents(month: reminder.month, day: reminder.dayOfMonth, hour: h, minute: m)))
             }
-        case .monthly:
-            slots = [Slot(suffix: "monthly",
-                          dc: DateComponents(day: reminder.dayOfMonth, hour: h, minute: m))]
-        case .yearly:
-            slots = [Slot(suffix: "yearly",
-                          dc: DateComponents(month: reminder.month, day: reminder.dayOfMonth, hour: h, minute: m))]
         }
         await schedule(
             idBase: "\(customIdPrefix)\(reminder.id.uuidString)",
@@ -146,11 +150,13 @@ enum ReminderService {
         }
     }
 
-    /// 取消某个 idBase 下所有可能后缀的 pending 通知(daily/monthly/yearly + 7 个 weekday,不漏)。
+    /// 取消某个 idBase 下所有可能后缀的 pending 通知,不漏:
+    /// daily / yearly / 旧版 monthly + 7 个 weekday(w1...w7)+ 31 个月内日(m1...m31)。
     private static func cancelBase(_ idBase: String) {
         let center = UNUserNotificationCenter.current()
         var ids = ["\(idBase).daily", "\(idBase).monthly", "\(idBase).yearly"]
         ids += (1...7).map { "\(idBase).w\($0)" }
+        ids += (1...31).map { "\(idBase).m\($0)" }
         center.removePendingNotificationRequests(withIdentifiers: ids)
     }
 }