```

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/Profile/MedicationLibraryView.swift

@@ -0,0 +1,383 @@
+import SwiftUI
+import SwiftData
+
+/// 「记录 · 药品库」管理页:我有哪些药的 master 清单(药名 / 规格 / 用法 / 原图)。
+/// 拍药盒识别或手动录入入库;某次服用流水另走「写日记 · 用药」(带 `DiaryEntry.medicationTag` 的日记,含剂量 + 时间)。
+/// 列表 / 增删改范式照搬 `CustomMetricsListView`;编辑表单照搬 `CustomReminderEditSheet`。
+struct MedicationLibraryView: View {
+    @Environment(\.modelContext) private var ctx
+    @Environment(\.dismiss) private var dismiss
+
+    @Query(sort: \Medication.updatedAt, order: .reverse)
+    private var medications: [Medication]
+
+    /// sheet 形态(从「记录」拉起)补「完成」按钮;push 形态不补,靠返回键。
+    var presentedAsSheet: Bool = false
+
+    @State private var editingTarget: MedicationEditTarget?
+    @State private var showScan = false
+
+    var body: some View {
+        ScrollView {
+            VStack(alignment: .leading, spacing: 12) {
+                hintBanner
+                if medications.isEmpty {
+                    emptyState
+                } else {
+                    ForEach(medications) { m in
+                        Button {
+                            editingTarget = MedicationEditTarget(medication: m)
+                        } label: {
+                            row(m)
+                        }
+                        .buttonStyle(.plain)
+                    }
+                }
+            }
+            .padding(.horizontal, 16)
+            .padding(.top, 8)
+            .padding(.bottom, 32)
+        }
+        .background(Tj.Palette.sand.ignoresSafeArea())
+        .navigationTitle("药品库")
+        .navigationBarTitleDisplayMode(.inline)
+        .toolbar {
+            if presentedAsSheet {
+                ToolbarItem(placement: .topBarLeading) {
+                    Button(String(appLoc: "完成")) { dismiss() }
+                }
+            }
+            ToolbarItem(placement: .topBarTrailing) {
+                HStack(spacing: 16) {
+                    Button { showScan = true } label: {
+                        Image(systemName: "camera")
+                            .font(.tjScaled( 16, weight: .semibold))
+                    }
+                    .accessibilityLabel(String(appLoc: "拍药盒添加"))
+                    Button { editingTarget = MedicationEditTarget(medication: nil) } label: {
+                        Image(systemName: "plus")
+                            .font(.tjScaled( 16, weight: .semibold))
+                    }
+                    .accessibilityLabel(String(appLoc: "手动添加"))
+                }
+            }
+        }
+        .sheet(item: $editingTarget) { target in
+            MedicationEditSheet(existing: target.medication)
+        }
+        .fullScreenCover(isPresented: $showScan) {
+            // 拍药盒 → 本地 OCR + LLM 识别 → 核对 → 入药品库(含原图)。
+            MedicationScanFlow(
+                onSave: { meds, images in
+                    MedicationArchiver.archive(medications: meds, images: images, in: ctx)
+                },
+                onClose: { showScan = false }
+            )
+        }
+    }
+
+    // MARK: - subviews
+
+    private var hintBanner: some View {
+        HStack(spacing: 10) {
+            Image(systemName: "info.circle.fill")
+                .foregroundStyle(Tj.Palette.text3)
+            Text("药品库是你的常用药清单。记录某次服用请到「写日记 · 用药」,可填剂量和时间。")
+                .font(.tjScaled( 12))
+                .foregroundStyle(Tj.Palette.text2)
+                .fixedSize(horizontal: false, vertical: true)
+            Spacer(minLength: 0)
+        }
+        .padding(12)
+        .background(
+            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
+                .fill(Tj.Palette.sand2.opacity(0.5))
+        )
+    }
+
+    private var emptyState: some View {
+        VStack(spacing: 14) {
+            Spacer(minLength: 40)
+            TjPlaceholder(label: String(appLoc: "药品库还是空的"))
+                .frame(width: 220, height: 130)
+            Text("右上角拍药盒或 + 手动添加")
+                .font(.tjScaled( 12))
+                .foregroundStyle(Tj.Palette.text3)
+            Spacer()
+        }
+        .frame(maxWidth: .infinity)
+    }
+
+    private func row(_ m: Medication) -> some View {
+        HStack(spacing: 12) {
+            ZStack {
+                Circle().fill(Tj.Palette.leafSoft)
+                Image(systemName: "pills.fill")
+                    .font(.tjScaled( 17, weight: .medium))
+                    .foregroundStyle(Tj.Palette.ink)
+            }
+            .frame(width: 40, height: 40)
+
+            VStack(alignment: .leading, spacing: 3) {
+                Text(m.name)
+                    .font(.tjScaled( 15, weight: .semibold))
+                    .foregroundStyle(Tj.Palette.text)
+                    .lineLimit(1)
+                if !m.detailLine.isEmpty {
+                    Text(m.detailLine)
+                        .font(.tjScaled( 11))
+                        .foregroundStyle(Tj.Palette.text3)
+                        .lineLimit(1)
+                }
+            }
+
+            Spacer(minLength: 8)
+
+            if !m.assets.isEmpty {
+                Text("📷 \(m.assets.count)")
+                    .font(.tjScaled( 11))
+                    .foregroundStyle(Tj.Palette.text3)
+            }
+            Image(systemName: "chevron.right")
+                .font(.tjScaled( 11, weight: .medium))
+                .foregroundStyle(Tj.Palette.text3)
+        }
+        .padding(14)
+        .background(
+            RoundedRectangle(cornerRadius: Tj.Radius.md, style: .continuous)
+                .fill(Tj.Palette.paper)
+        )
+        .overlay(
+            RoundedRectangle(cornerRadius: Tj.Radius.md, style: .continuous)
+                .strokeBorder(Tj.Palette.lineSoft, lineWidth: 1)
+        )
+    }
+}
+
+/// `medication == nil` → 新建;否则编辑。`id` 用 UUID 让同一对象重开 sheet 也能刷新。
+private struct MedicationEditTarget: Identifiable {
+    let id = UUID()
+    let medication: Medication?
+}
+
+/// 药品库的新建 / 编辑表单(范式同 `CustomReminderEditSheet`:本地 @State 暂存,保存才写库)。
+private struct MedicationEditSheet: View {
+    @Environment(\.modelContext) private var ctx
+    @Environment(\.dismiss) private var dismiss
+
+    /// nil = 新建模式。
+    let existing: Medication?
+
+    @State private var name = ""
+    @State private var strength = ""
+    @State private var usage = ""
+    @State private var note = ""
+    @State private var hydrated = false
+    /// 点缩略图全屏查看的起始页;nil = 未打开查看器。
+    @State private var viewerStart: PhotoIndex?
+
+    private var isEditing: Bool { existing != nil }
+    private var canSave: Bool {
+        !name.trimmingCharacters(in: .whitespacesAndNewlines).isEmpty
+    }
+
+    var body: some View {
+        NavigationStack {
+            Form {
+                if let m = existing, !m.assets.isEmpty {
+                    Section {
+                        ScrollView(.horizontal, showsIndicators: false) {
+                            HStack(spacing: 10) {
+                                ForEach(Array(m.assets.enumerated()), id: \.offset) { idx, asset in
+                                    Button {
+                                        viewerStart = PhotoIndex(index: idx)
+                                    } label: {
+                                        MedicationAssetThumb(asset: asset)
+                                    }
+                                    .buttonStyle(.plain)
+                                }
+                            }
+                            .padding(.vertical, 4)
+                        }
+                        .listRowInsets(EdgeInsets(top: 8, leading: 12, bottom: 8, trailing: 12))
+                    } header: {
+                        Text(String(appLoc: "原图\(m.assets.count)张"))
+                    } footer: {
+                        Text("点图片可放大查看。原图均存在本机加密目录,不上传。")
+                    }
+                }
+
+                Section {
+                    TextField(String(appLoc: "药名,如:缬沙坦胶囊"), text: $name)
+                        .foregroundStyle(Tj.Palette.text)
+                    TextField(String(appLoc: "规格,如:80mg×7粒"), text: $strength)
+                        .foregroundStyle(Tj.Palette.text2)
+                    TextField(String(appLoc: "用法,如:一日一次,一次一粒"), text: $usage)
+                        .foregroundStyle(Tj.Palette.text2)
+                } footer: {
+                    Text("仅作清单记录,不提供任何用药或剂量建议。")
+                }
+
+                Section {
+                    TextField(String(appLoc: "备注(可选)"), text: $note, axis: .vertical)
+                        .lineLimit(1...3)
+                        .foregroundStyle(Tj.Palette.text2)
+                }
+
+                if isEditing {
+                    Section {
+                        Button(role: .destructive) { deleteMedication() } label: {
+                            Label(String(appLoc: "从药品库删除"), systemImage: "trash")
+                        }
+                    }
+                }
+            }
+            .scrollContentBackground(.hidden)
+            .background(Tj.Palette.sand.ignoresSafeArea())
+            .navigationTitle(isEditing ? String(appLoc: "编辑药品") : String(appLoc: "添加药品"))
+            .navigationBarTitleDisplayMode(.inline)
+            .toolbar {
+                ToolbarItem(placement: .topBarLeading) {
+                    Button(String(appLoc: "取消")) { dismiss() }
+                }
+                ToolbarItem(placement: .topBarTrailing) {
+                    Button(String(appLoc: "保存")) { save() }
+                        .fontWeight(.semibold)
+                        .disabled(!canSave)
+                }
+            }
+            .onAppear(perform: hydrate)
+            .fullScreenCover(item: $viewerStart) { start in
+                if let m = existing {
+                    MedicationPhotoViewer(assets: m.assets, startIndex: start.index)
+                }
+            }
+        }
+    }
+
+    private func hydrate() {
+        guard !hydrated else { return }
+        hydrated = true
+        if let m = existing {
+            name = m.name
+            strength = m.strength
+            usage = m.usage
+            note = m.note ?? ""
+        }
+    }
+
+    private func save() {
+        guard canSave else { return }
+        let n = name.trimmingCharacters(in: .whitespacesAndNewlines)
+        let s = strength.trimmingCharacters(in: .whitespacesAndNewlines)
+        let u = usage.trimmingCharacters(in: .whitespacesAndNewlines)
+        let nt = note.trimmingCharacters(in: .whitespacesAndNewlines)
+        if let m = existing {
+            m.name = n
+            m.strength = s
+            m.usage = u
+            m.note = nt.isEmpty ? nil : nt
+            m.updatedAt = .now
+        } else {
+            let med = Medication(name: n, strength: s, usage: u, note: nt.isEmpty ? nil : nt)
+            ctx.insert(med)
+        }
+        try? ctx.save()
+        dismiss()
+    }
+
+    private func deleteMedication() {
+        guard let m = existing else { return }
+        // 先删 Vault 里的 JPEG(cascade 只删 Asset 记录,文件要手动 unlink,§6 永久删除)。
+        for a in m.assets {
+            try? FileVault.shared.remove(relativePath: a.relativePath)
+        }
+        ctx.delete(m)
+        try? ctx.save()
+        dismiss()
+    }
+}
+
+// MARK: - 原图查看
+
+/// 全屏查看器的起始页载体(`.fullScreenCover(item:)` 需 Identifiable)。
+private struct PhotoIndex: Identifiable {
+    let id = UUID()
+    let index: Int
+}
+
+/// 药品库行内 / 编辑表单里的方形缩略图。原图从加密 Vault 同步读取(数量少,与 EvidenceImagePage 同款)。
+private struct MedicationAssetThumb: View {
+    let asset: Asset
+
+    var body: some View {
+        VaultImage(relativePath: asset.relativePath, maxPixel: 500) { img in
+            Image(uiImage: img).resizable().scaledToFill()
+        } placeholder: { isLoading in
+            if isLoading {
+                Tj.Palette.paper
+            } else {
+                TjPlaceholder(label: String(appLoc: "原图无法读取"))
+            }
+        }
+        .frame(width: 150, height: 150)
+        .clipped()
+        .clipShape(RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous))
+        .overlay(
+            RoundedRectangle(cornerRadius: Tj.Radius.sm, style: .continuous)
+                .strokeBorder(Tj.Palette.lineSoft, lineWidth: 1)
+        )
+    }
+}
+
+/// 全屏翻页查看药品原图(看清药盒小字)。
+private struct MedicationPhotoViewer: View {
+    @Environment(\.dismiss) private var dismiss
+    let assets: [Asset]
+    @State private var selection: Int
+
+    init(assets: [Asset], startIndex: Int) {
+        self.assets = assets
+        _selection = State(initialValue: min(max(startIndex, 0), max(assets.count - 1, 0)))
+    }
+
+    var body: some View {
+        ZStack(alignment: .topTrailing) {
+            Color.black.ignoresSafeArea()
+
+            TabView(selection: $selection) {
+                ForEach(Array(assets.enumerated()), id: \.offset) { idx, asset in
+                    VaultImage(relativePath: asset.relativePath, maxPixel: 2000) { img in
+                        Image(uiImage: img).resizable().scaledToFit()
+                    } placeholder: { isLoading in
+                        if isLoading {
+                            ProgressView().tint(.white)
+                        } else {
+                            TjPlaceholder(label: String(appLoc: "原图无法读取"))
+                        }
+                    }
+                    .tag(idx)
+                }
+            }
+            .tabViewStyle(.page(indexDisplayMode: assets.count > 1 ? .automatic : .never))
+            .ignoresSafeArea()
+
+            Button { dismiss() } label: {
+                Image(systemName: "xmark")
+                    .font(.tjScaled( 16, weight: .semibold))
+                    .foregroundStyle(.white)
+                    .frame(width: 36, height: 36)
+                    .background(Circle().fill(.black.opacity(0.4)))
+            }
+            .padding(.trailing, 18)
+            .padding(.top, 14)
+        }
+    }
+}
+
+#Preview {
+    NavigationStack {
+        MedicationLibraryView(presentedAsSheet: true)
+    }
+    .modelContainer(for: [Medication.self, Asset.self], inMemory: true)
+}