```

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/Features/Me/CustomReminderEditSheet.swift

@@ -10,13 +10,20 @@ struct CustomReminderEditSheet: View {
 
     /// nil = 新建模式。
     let reminder: CustomReminder?
+    /// 新建模式下的预填(如从「用药记录」点药进来,预填「吃药:药名」+ 用法备注)。
+    /// 编辑模式(reminder != nil)忽略。
+    private let prefillTitle: String
+    private let prefillNote: String
 
     @State private var title = ""
     @State private var note = ""
     @State private var pickedTime: Date = .now
-    @State private var frequency: CustomReminder.Frequency = .daily
+    /// 多选频率(每日/每周/每月/每年 可同时勾选)。
+    @State private var frequencies: Set<CustomReminder.Frequency> = [.daily]
     @State private var weekdays: Set<Int> = Set(1...7)
-    @State private var dayOfMonth = 1
+    /// 每月多选日期(1...31)。
+    @State private var monthDays: Set<Int> = [1]
+    @State private var dayOfMonth = 1   // 仅「每年」用
     @State private var month = 1
     @State private var hydrated = false
     @State private var showAuthDeniedAlert = false
@@ -24,8 +31,10 @@ struct CustomReminderEditSheet: View {
     /// 常用时间快捷预设(时, 分):早 / 午 / 傍晚 / 睡前。
     private let timePresets: [(h: Int, m: Int)] = [(8, 0), (12, 0), (18, 0), (22, 0)]
 
-    init(reminder: CustomReminder? = nil) {
+    init(reminder: CustomReminder? = nil, prefillTitle: String = "", prefillNote: String = "") {
         self.reminder = reminder
+        self.prefillTitle = prefillTitle
+        self.prefillNote = prefillNote
     }
 
     private var isEditing: Bool { reminder != nil }
@@ -33,8 +42,9 @@ struct CustomReminderEditSheet: View {
         title.trimmingCharacters(in: .whitespacesAndNewlines)
     }
     private var canSave: Bool {
-        guard !trimmedTitle.isEmpty else { return false }
-        if frequency == .weekly { return !weekdays.isEmpty }
+        guard !trimmedTitle.isEmpty, !frequencies.isEmpty else { return false }
+        if frequencies.contains(.weekly) && weekdays.isEmpty { return false }
+        if frequencies.contains(.monthly) && monthDays.isEmpty { return false }
         return true
     }
 
@@ -51,18 +61,12 @@ struct CustomReminderEditSheet: View {
                 }
 
                 Section {
-                    Picker(String(appLoc: "重复"), selection: $frequency) {
-                        Text(String(appLoc: "每日")).tag(CustomReminder.Frequency.daily)
-                        Text(String(appLoc: "每周")).tag(CustomReminder.Frequency.weekly)
-                        Text(String(appLoc: "每月")).tag(CustomReminder.Frequency.monthly)
-                        Text(String(appLoc: "每年")).tag(CustomReminder.Frequency.yearly)
-                    }
-                    .pickerStyle(.segmented)
-                    .listRowBackground(Color.clear)
-
+                    frequencyChips
                     frequencyDetail
                 } header: {
                     Text("重复")
+                } footer: {
+                    Text("可多选:如同时勾选「每周一三五」+「每月1日」,两种节奏都会提醒。")
                 }
 
                 Section {
@@ -109,23 +113,60 @@ struct CustomReminderEditSheet: View {
         }
     }
 
-    // MARK: - 频率子控件
+    // MARK: - 频率多选 chip
+
+    private static let freqOrder: [CustomReminder.Frequency] = [.daily, .weekly, .monthly, .yearly]
+
+    private func freqLabel(_ f: CustomReminder.Frequency) -> String {
+        switch f {
+        case .daily:   return String(appLoc: "每日")
+        case .weekly:  return String(appLoc: "每周")
+        case .monthly: return String(appLoc: "每月")
+        case .yearly:  return String(appLoc: "每年")
+        }
+    }
+
+    private var frequencyChips: some View {
+        HStack(spacing: 8) {
+            ForEach(Self.freqOrder, id: \.self) { f in
+                let on = frequencies.contains(f)
+                Button {
+                    if on { frequencies.remove(f) } else { frequencies.insert(f) }
+                } label: {
+                    Text(freqLabel(f))
+                        .font(.tjScaled( 13, weight: on ? .semibold : .regular))
+                        .foregroundStyle(on ? Tj.Palette.paper : Tj.Palette.text)
+                        .frame(maxWidth: .infinity, minHeight: 32)
+                        .background(
+                            RoundedRectangle(cornerRadius: 8, style: .continuous)
+                                .fill(on ? Tj.Palette.ink : Tj.Palette.paper)
+                        )
+                        .overlay(
+                            RoundedRectangle(cornerRadius: 8, style: .continuous)
+                                .strokeBorder(Tj.Palette.line, lineWidth: on ? 0 : 1)
+                        )
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .listRowBackground(Color.clear)
+    }
+
+    // MARK: - 频率子控件(随勾选项展开,可同时出现多组)
 
     @ViewBuilder
     private var frequencyDetail: some View {
-        switch frequency {
-        case .daily:
-            EmptyView()
-        case .weekly:
+        if frequencies.contains(.weekly) {
+            subCaption(String(appLoc: "每周 · 选星期几"))
             weekdayRow
-        case .monthly:
-            Picker(String(appLoc: "日期"), selection: $dayOfMonth) {
-                ForEach(1...31, id: \.self) { d in
-                    Text(String(appLoc: "\(d)日")).tag(d)
-                }
-            }
-            if dayOfMonth >= 29 { skipHint }
-        case .yearly:
+        }
+        if frequencies.contains(.monthly) {
+            subCaption(String(appLoc: "每月 · 选日期(可多选)"))
+            monthDayGrid
+            if monthDays.contains(where: { $0 >= 29 }) { skipHint }
+        }
+        if frequencies.contains(.yearly) {
+            subCaption(String(appLoc: "每年 · 选月/日"))
             Picker(String(appLoc: "月份"), selection: $month) {
                 ForEach(1...12, id: \.self) { mo in
                     Text(String(appLoc: "\(mo)月")).tag(mo)
@@ -140,6 +181,41 @@ struct CustomReminderEditSheet: View {
         }
     }
 
+    private func subCaption(_ text: String) -> some View {
+        Text(text)
+            .font(.tjScaled( 11, weight: .semibold))
+            .foregroundStyle(Tj.Palette.text3)
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .listRowBackground(Color.clear)
+    }
+
+    /// 每月日期多选网格(1...31,7 列)。
+    private var monthDayGrid: some View {
+        LazyVGrid(columns: Array(repeating: GridItem(.flexible(), spacing: 6), count: 7), spacing: 6) {
+            ForEach(1...31, id: \.self) { d in
+                let on = monthDays.contains(d)
+                Button {
+                    if on { monthDays.remove(d) } else { monthDays.insert(d) }
+                } label: {
+                    Text("\(d)")
+                        .font(.tjScaled( 12, weight: on ? .semibold : .regular))
+                        .foregroundStyle(on ? Tj.Palette.paper : Tj.Palette.text)
+                        .frame(maxWidth: .infinity, minHeight: 30)
+                        .background(
+                            RoundedRectangle(cornerRadius: 6, style: .continuous)
+                                .fill(on ? Tj.Palette.ink : Tj.Palette.paper)
+                        )
+                        .overlay(
+                            RoundedRectangle(cornerRadius: 6, style: .continuous)
+                                .strokeBorder(Tj.Palette.line, lineWidth: on ? 0 : 1)
+                        )
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .listRowBackground(Color.clear)
+    }
+
     private var skipHint: some View {
         Text(String(appLoc: "部分月份无此日,该月将跳过"))
             .font(.tjScaled( 11))
@@ -229,13 +305,18 @@ struct CustomReminderEditSheet: View {
         if let r = reminder {
             title = r.title
             note = r.note
-            frequency = r.frequency
+            frequencies = r.frequencies
             weekdays = Set(r.weekdays)
+            monthDays = Set(r.monthlyDays)
             dayOfMonth = r.dayOfMonth
             month = r.month
             pickedTime = Calendar.current.date(
                 bySettingHour: r.hour, minute: r.minute, second: 0, of: .now
             ) ?? .now
+        } else {
+            // 新建模式:从调用方带进来的预填(药名 / 用法)。
+            title = prefillTitle
+            note = prefillNote
         }
     }
 
@@ -245,6 +326,7 @@ struct CustomReminderEditSheet: View {
         let hour = cal.component(.hour, from: pickedTime)
         let minute = cal.component(.minute, from: pickedTime)
         let sortedDays = weekdays.sorted()
+        let sortedMonthDays = monthDays.sorted()
 
         let target: CustomReminder
         if let r = reminder {
@@ -253,8 +335,9 @@ struct CustomReminderEditSheet: View {
             r.hour = hour
             r.minute = minute
             r.weekdays = sortedDays
-            r.frequency = frequency
-            r.dayOfMonth = dayOfMonth
+            r.frequencies = frequencies        // 写 frequenciesRaw(+ 代表 frequencyRaw)
+            r.monthlyDays = sortedMonthDays     // 写 monthDays
+            r.dayOfMonth = dayOfMonth           // 仅每年用
             r.month = month
             r.updatedAt = .now
             target = r
@@ -265,10 +348,11 @@ struct CustomReminderEditSheet: View {
                 hour: hour,
                 minute: minute,
                 weekdays: sortedDays,
-                frequency: frequency,
                 dayOfMonth: dayOfMonth,
                 month: month
             )
+            new.frequencies = frequencies
+            new.monthlyDays = sortedMonthDays
             ctx.insert(new)
             target = new
         }