```

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/Trends/TrendsView.swift

@@ -12,6 +12,10 @@ struct TrendsView: View {
 
     private var profile: UserProfile? { profiles.first }
 
+    /// 顶部搜索:点放大镜展开搜索框,按指标名(bucket.title)实时过滤两段列表。
+    @State private var searching = false
+    @State private var query = ""
+
     private var seriesBuckets: [SeriesBucket] {
         SeriesBucket.build(from: indicators,
                            profile: profile,
@@ -25,6 +29,14 @@ struct TrendsView: View {
         seriesBuckets.filter { $0.kind == .lab }
     }
 
+    private func filtered(_ buckets: [SeriesBucket]) -> [SeriesBucket] {
+        let q = query.trimmingCharacters(in: .whitespaces)
+        guard !q.isEmpty else { return buckets }
+        return buckets.filter { $0.title.localizedCaseInsensitiveContains(q) }
+    }
+    private var filteredMonitor: [SeriesBucket] { filtered(monitorBuckets) }
+    private var filteredLab: [SeriesBucket] { filtered(labBuckets) }
+
     var body: some View {
         NavigationStack {
             ScrollView(showsIndicators: false) {
@@ -32,12 +44,14 @@ struct TrendsView: View {
                     header.padding(.top, 4)
                     if seriesBuckets.isEmpty {
                         emptyState
+                    } else if filteredMonitor.isEmpty && filteredLab.isEmpty {
+                        noMatchState
                     } else {
-                        if !monitorBuckets.isEmpty {
-                            section(title: String(appLoc: "长期监测"), buckets: monitorBuckets)
+                        if !filteredMonitor.isEmpty {
+                            section(title: String(appLoc: "长期监测"), buckets: filteredMonitor)
                         }
-                        if !labBuckets.isEmpty {
-                            section(title: String(appLoc: "化验指标趋势"), buckets: labBuckets)
+                        if !filteredLab.isEmpty {
+                            section(title: String(appLoc: "化验指标趋势"), buckets: filteredLab)
                         }
                     }
                 }
@@ -51,9 +65,73 @@ struct TrendsView: View {
     }
 
     private var header: some View {
-        Text("趋势")
-            .font(.tjTitle(26))
-            .foregroundStyle(Tj.Palette.text)
+        VStack(alignment: .leading, spacing: 12) {
+            HStack(alignment: .lastTextBaseline) {
+                Text("趋势")
+                    .font(.tjTitle(26))
+                    .foregroundStyle(Tj.Palette.text)
+                Spacer()
+                searchToggle
+            }
+            if searching { searchField }
+        }
+    }
+
+    private var searchToggle: some View {
+        Button {
+            withAnimation(.easeInOut(duration: 0.18)) {
+                searching.toggle()
+                if !searching { query = "" }
+            }
+        } label: {
+            Image(systemName: searching ? "xmark" : "magnifyingglass")
+                .font(.tjScaled( 15, weight: .semibold))
+                .foregroundStyle(Tj.Palette.text)
+                .frame(width: 36, height: 36)
+                .background(Circle().fill(Tj.Palette.sand2))
+        }
+        .buttonStyle(.plain)
+        .accessibilityLabel(searching ? 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: $query)
+                .textInputAutocapitalization(.never)
+                .autocorrectionDisabled()
+                .foregroundStyle(Tj.Palette.text)
+                .tint(Tj.Palette.ink)
+            if !query.isEmpty {
+                Button { query = "" } label: {
+                    Image(systemName: "xmark.circle.fill")
+                        .foregroundStyle(Tj.Palette.text3)
+                }
+                .buttonStyle(.plain)
+            }
+        }
+        .padding(.horizontal, 12)
+        .padding(.vertical, 10)
+        .background(
+            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
+                .fill(Tj.Palette.paper)
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
+                .strokeBorder(Tj.Palette.line, lineWidth: 1)
+        )
+    }
+
+    private var noMatchState: some View {
+        VStack(spacing: 12) {
+            TjPlaceholder(label: String(appLoc: "没有匹配「\(query)」的指标"))
+                .frame(height: 120)
+                .frame(maxWidth: 260)
+        }
+        .frame(maxWidth: .infinity)
+        .padding(.top, 60)
     }
 
     private func section(title: String, buckets: [SeriesBucket]) -> some View {