```

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/Indicator/IndicatorQuickSheet.swift

@@ -31,6 +31,18 @@ struct IndicatorQuickSheet: View {
     /// nil 时(如 Preview)不显示拍照按钮。
     var onRequestCamera: (() -> Void)? = nil
 
+    /// 从已有指标「再记一条」时的预选目标。nil = 正常空白新建。
+    /// seriesKey 命中 MonitorMetric / CustomMonitorMetric → 预选对应预设(保留进趋势 + 自动判异常);
+    /// 否则按 name/unit/range 走自由输入预填。数值一律留空,由用户填新读数。
+    var prefill: Prefill? = nil
+
+    struct Prefill: Equatable {
+        var seriesKey: String?
+        var name: String = ""
+        var unit: String = ""
+        var range: String = ""
+    }
+
     @Environment(\.modelContext) private var ctx
     @Environment(\.dismiss) private var dismiss
     @Query private var profiles: [UserProfile]
@@ -69,6 +81,32 @@ struct IndicatorQuickSheet: View {
     // 隐藏管理 sheet 触发态
     @State private var showHiddenSheet: Bool = false
 
+    // 「再记一条」预选只应用一次
+    @State private var didApplyPrefill = false
+
+    // 顶部搜索:点放大镜展开搜索框,按名实时过滤长期监测预设 / 自定义指标 / 化验项快捷。
+    @State private var searchingMetrics = false
+    @State private var metricQuery = ""
+
+    private var isSearchingMetrics: Bool {
+        !metricQuery.trimmingCharacters(in: .whitespaces).isEmpty
+    }
+    private var filteredMonitorMetrics: [MonitorMetric] {
+        let q = metricQuery.trimmingCharacters(in: .whitespaces)
+        guard !q.isEmpty else { return visibleMonitorMetrics }
+        return visibleMonitorMetrics.filter { $0.displayName.localizedCaseInsensitiveContains(q) }
+    }
+    private var filteredCustomMetrics: [CustomMonitorMetric] {
+        let q = metricQuery.trimmingCharacters(in: .whitespaces)
+        guard !q.isEmpty else { return customMetrics }
+        return customMetrics.filter { $0.name.localizedCaseInsensitiveContains(q) }
+    }
+    private var filteredLabPresets: [IndicatorPreset] {
+        let q = metricQuery.trimmingCharacters(in: .whitespaces)
+        guard !q.isEmpty else { return labPresets }
+        return labPresets.filter { $0.name.localizedCaseInsensitiveContains(q) }
+    }
+
     private static var defaultReminderTime: Date {
         Calendar.current.date(bySettingHour: 8, minute: 0, second: 0, of: .now) ?? .now
     }
@@ -137,6 +175,7 @@ struct IndicatorQuickSheet: View {
 
             footer
         }
+        .onAppear { applyPrefillIfNeeded() }
         .task(id: longTermKey) { hydrateReminder() }
         .background(
             Tj.Palette.sand
@@ -161,19 +200,64 @@ struct IndicatorQuickSheet: View {
     }
 
     private var header: some View {
-        HStack {
-            Text("记录指标")
-                .font(.tjH2())
-                .foregroundStyle(Tj.Palette.text)
-            Spacer()
-            Text("本地处理 · 永不上传")
-                .font(.tjScaled( 12))
-                .foregroundStyle(Tj.Palette.text3)
+        VStack(spacing: 12) {
+            HStack(spacing: 10) {
+                Text("记录指标")
+                    .font(.tjH2())
+                    .foregroundStyle(Tj.Palette.text)
+                Spacer()
+                Text("本地处理 · 永不上传")
+                    .font(.tjScaled( 12))
+                    .foregroundStyle(Tj.Palette.text3)
+                searchToggle
+            }
+            if searchingMetrics { searchField }
         }
         .padding(.horizontal, 20)
         .padding(.bottom, 16)
     }
 
+    private var searchToggle: some View {
+        Button {
+            withAnimation(.easeInOut(duration: 0.18)) {
+                searchingMetrics.toggle()
+                if !searchingMetrics { metricQuery = "" }
+            }
+        } label: {
+            Image(systemName: searchingMetrics ? "xmark" : "magnifyingglass")
+                .font(.tjScaled( 14, weight: .semibold))
+                .foregroundStyle(Tj.Palette.text)
+                .frame(width: 32, height: 32)
+                .background(Circle().fill(Tj.Palette.sand2))
+        }
+        .buttonStyle(.plain)
+        .accessibilityLabel(searchingMetrics ? String(appLoc: "关闭搜索") : String(appLoc: "搜索指标"))
+    }
+
+    private var searchField: some View {
+        HStack(spacing: 8) {
+            Image(systemName: "magnifyingglass")
+                .font(.tjScaled( 13))
+                .foregroundStyle(Tj.Palette.text3)
+            TextField(String(appLoc: "搜索指标名"), text: $metricQuery)
+                .textInputAutocapitalization(.never)
+                .autocorrectionDisabled()
+                .foregroundStyle(Tj.Palette.text)
+                .tint(Tj.Palette.ink)
+            if !metricQuery.isEmpty {
+                Button { metricQuery = "" } label: {
+                    Image(systemName: "xmark.circle.fill")
+                        .foregroundStyle(Tj.Palette.text3)
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 10)
+        .background(fieldBg)
+        .overlay(fieldBorder)
+    }
+
     /// 顶部「拍照识别」入口:并入原「指标速记」。点后由 RootView 切到相机 VL 流程。
     @ViewBuilder
     private var cameraEntrySection: some View {
@@ -241,13 +325,19 @@ struct IndicatorQuickSheet: View {
             }
             let columns = [GridItem(.flexible()), GridItem(.flexible())]
             LazyVGrid(columns: columns, spacing: 8) {
-                ForEach(visibleMonitorMetrics) { m in
+                ForEach(filteredMonitorMetrics) { m in
                     monitorTile(m)
                 }
-                ForEach(customMetrics) { cm in
+                ForEach(filteredCustomMetrics) { cm in
                     customTile(cm)
                 }
-                addCustomTile
+                // 搜索态下不显示「自定义(新建)」格,聚焦过滤结果。
+                if !isSearchingMetrics { addCustomTile }
+            }
+            if isSearchingMetrics, filteredMonitorMetrics.isEmpty, filteredCustomMetrics.isEmpty {
+                Text("没有匹配的长期监测指标")
+                    .font(.tjScaled( 12))
+                    .foregroundStyle(Tj.Palette.text3)
             }
         }
         .sheet(isPresented: $showHiddenSheet) {
@@ -386,14 +476,18 @@ struct IndicatorQuickSheet: View {
         }
     }
 
+    @ViewBuilder
     private var labPresetSection: some View {
-        VStack(alignment: .leading, spacing: 8) {
-            sectionLabel(String(appLoc: "化验项快捷(不进趋势)"))
-            ScrollView(.horizontal, showsIndicators: false) {
-                HStack(spacing: 8) {
-                    ForEach(labPresets) { p in
-                        chip(p.name, selected: selectedLabPreset == p) {
-                            applyLab(p)
+        // 搜索且化验项无匹配:整段隐藏(避免只剩一个空标题)。
+        if !(isSearchingMetrics && filteredLabPresets.isEmpty) {
+            VStack(alignment: .leading, spacing: 8) {
+                sectionLabel(String(appLoc: "化验项快捷(不进趋势)"))
+                ScrollView(.horizontal, showsIndicators: false) {
+                    HStack(spacing: 8) {
+                        ForEach(filteredLabPresets) { p in
+                            chip(p.name, selected: selectedLabPreset == p) {
+                                applyLab(p)
+                            }
                         }
                     }
                 }
@@ -941,6 +1035,29 @@ struct IndicatorQuickSheet: View {
 
     // MARK: - apply preset
 
+    /// 「再记一条」预选:seriesKey 命中长期监测预设 / 自定义指标则选中对应卡片(进趋势 + 自动判异常),
+    /// 否则按 name/unit/range 走自由输入。数值不预填——让用户填新读数。只应用一次。
+    private func applyPrefillIfNeeded() {
+        guard !didApplyPrefill, let p = prefill else { return }
+        didApplyPrefill = true
+        if let key = p.seriesKey {
+            if let m = MonitorMetric.allCases.first(where: { metric in
+                metric.fields.contains { $0.seriesKey == key }
+            }) {
+                applyMonitor(m)
+                return
+            }
+            if let cm = customMetrics.first(where: { $0.seriesKey == key }) {
+                applyCustom(cm)
+                return
+            }
+        }
+        // 无 seriesKey 或未匹配预设(化验项 / 报告 / 自由指标):自由输入预填,不带 seriesKey,不进趋势。
+        name = p.name
+        unit = p.unit
+        range = p.range
+    }
+
     private func applyMonitor(_ m: MonitorMetric) {
         if selectedMonitor == m {
             // 取消选择