feat(Me): 推理引擎切换页 + SME2 状态 + CLAUDE.md 更新(Phase 5 部分)

- InferenceSettingsView:MNN(CPU/SME2)/ MLX(GPU)单选切换,展示当前设备
  SME2 探测状态(A19 启用 / A17 回退);走设计系统卡片,新文件不动 WIP 的
  ModelManagementView
- MeView:「模型管理」下新增「推理引擎」入口,detail 显示 MNN·SME2 / MNN·CPU / MLX·GPU
- CLAUDE.md §2/§12:AI 运行时改为 MNN(主,SME2)+ MLX(兜底)双后端,
  卖点 #2 明确 MNN+Arm SME2 端侧 CPU 加速为挑战赛考核点

模拟器 BUILD SUCCEEDED,0 error。

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

康康/Features/Me/InferenceSettingsView.swift

@@ -0,0 +1,126 @@
+import SwiftUI
+
+/// 推理引擎设置:在 MNN(CPU/SME2,考核路径)与 MLX(GPU,兜底)间切换,并展示 SME2 探测状态。
+/// 切换只改持久化选择;下一次 AI 调用(prepare/generate)按新引擎加载。
+struct InferenceSettingsView: View {
+    @AppStorage("kk.inferenceEngine") private var engineRaw = InferenceEngine.mnn.rawValue
+
+    private var selected: InferenceEngine {
+        InferenceEngine(rawValue: engineRaw) ?? .mnn
+    }
+
+    var body: some View {
+        ScrollView {
+            VStack(spacing: 12) {
+                HStack {
+                    Text("推理引擎")
+                        .font(.tjTitle())
+                        .foregroundStyle(Tj.Palette.text)
+                    Spacer()
+                }
+                .padding(.top, 4)
+                .padding(.bottom, 6)
+
+                ForEach(InferenceEngine.allCases, id: \.self) { engine in
+                    engineRow(engine)
+                }
+
+                sme2Card
+                noteCard
+            }
+            .padding(.horizontal, 16)
+            .padding(.vertical, 20)
+        }
+        .background(Tj.Palette.sand.ignoresSafeArea())
+    }
+
+    private func engineRow(_ engine: InferenceEngine) -> some View {
+        let available = engine.isAvailable
+        let isOn = (selected == engine)
+        return Button {
+            guard available else { return }
+            engineRaw = engine.rawValue
+        } label: {
+            HStack(spacing: 12) {
+                ZStack {
+                    Circle().fill(isOn ? Tj.Palette.amber.opacity(0.25) : Tj.Palette.sand2)
+                    Image(systemName: engine == .mnn ? "cpu.fill" : "bolt.fill")
+                        .font(.tjScaled(18))
+                        .foregroundStyle(isOn ? Tj.Palette.ink : Tj.Palette.text2)
+                }
+                .frame(width: 44, height: 44)
+
+                VStack(alignment: .leading, spacing: 2) {
+                    Text(engine.displayName)
+                        .font(.tjScaled(15, weight: .semibold))
+                        .foregroundStyle(Tj.Palette.text)
+                    Text(subtitle(engine, available: available))
+                        .font(.tjScaled(12))
+                        .foregroundStyle(Tj.Palette.text3)
+                        .lineLimit(2)
+                }
+                Spacer()
+                if isOn {
+                    Image(systemName: "checkmark.circle.fill")
+                        .font(.tjScaled(18))
+                        .foregroundStyle(Tj.Palette.leaf)
+                }
+            }
+            .padding(14)
+            .tjCard()
+            .opacity(available ? 1 : 0.45)
+        }
+        .buttonStyle(.plain)
+        .disabled(!available)
+    }
+
+    private func subtitle(_ engine: InferenceEngine, available: Bool) -> String {
+        switch engine {
+        case .mnn:
+            if !available { return String(appLoc: "本设备/模拟器不可用,自动回退 MLX") }
+            return InferenceEngine.cpuSupportsSME2
+                ? String(appLoc: "端侧 CPU + SME2 加速 · 挑战赛考核路径")
+                : String(appLoc: "端侧 CPU(本机无 SME2,NEON 回退)")
+        case .mlx:
+            return String(appLoc: "Metal GPU · 兜底 / 对照")
+        }
+    }
+
+    private var sme2Card: some View {
+        let sme2 = InferenceEngine.cpuSupportsSME2
+        return HStack(spacing: 12) {
+            ZStack {
+                Circle().fill(sme2 ? Tj.Palette.leafSoft : Tj.Palette.sand2)
+                Image(systemName: sme2 ? "checkmark.seal.fill" : "minus.circle")
+                    .font(.tjScaled(18))
+                    .foregroundStyle(sme2 ? Tj.Palette.ink : Tj.Palette.text2)
+            }
+            .frame(width: 44, height: 44)
+            VStack(alignment: .leading, spacing: 2) {
+                Text("Arm SME2")
+                    .font(.tjScaled(15, weight: .medium))
+                    .foregroundStyle(Tj.Palette.text)
+                Text(sme2 ? String(appLoc: "本设备支持,MNN 已启用 SME2 加速")
+                          : String(appLoc: "本设备不支持(需 A19/iPhone 17+)"))
+                    .font(.tjScaled(12))
+                    .foregroundStyle(Tj.Palette.text3)
+            }
+            Spacer()
+        }
+        .padding(14)
+        .tjCard()
+    }
+
+    private var noteCard: some View {
+        Text("MNN 在端侧 CPU 上以 Arm SME2 指令集加速 Qwen 推理(本地、不上云)。切换后下一次 AI 调用生效。")
+            .font(.tjScaled(12))
+            .foregroundStyle(Tj.Palette.text3)
+            .frame(maxWidth: .infinity, alignment: .leading)
+            .padding(14)
+            .tjCard()
+    }
+}
+
+#Preview {
+    InferenceSettingsView()
+}

康康/Features/Me/MeView.swift

@@ -37,6 +37,7 @@ struct MeView: View {
                     profileCard
                     customMetricsCard
                     modelManagementCard
+                    inferenceEngineCard
                     languageCard
                     fontScaleCard
                     faceIDCard
@@ -157,6 +158,22 @@ struct MeView: View {
         return readyCount == 0 ? String(appLoc: "未下载") : String(appLoc: "\(readyCount)/\(ModelKind.allCases.count) 就绪")
     }
 
+    private var inferenceEngineCard: some View {
+        NavigationLink {
+            InferenceSettingsView()
+        } label: {
+            settingsCard(title: String(appLoc: "推理引擎"), detail: engineDetail, icon: "cpu.fill")
+        }
+        .buttonStyle(.plain)
+    }
+
+    private var engineDetail: String {
+        switch InferenceEngine.current {
+        case .mnn: return InferenceEngine.cpuSupportsSME2 ? "MNN · SME2" : "MNN · CPU"
+        case .mlx: return "MLX · GPU"
+        }
+    }
+
     private var languageCard: some View {
         NavigationLink {
             LanguageSettingsView()