feat(debug): DebugAIRunner DEBUG 自检入口挂到 MeView

按 W2 plan Task 7 落地,实现胜过 plan 原稿(强化 UX 减少 Xcode console
依赖):
- 卡片显示 Application Support 路径 + 模型预期完整路径
- 一键复制路径到剪贴板,方便 `cp -R` 拷模型
- 模型就绪状态徽章(✓ 就绪 / ⚠ 未就绪),依赖 ModelStore.isReady
- 跑一段 prompt 流式输出,顶部 tok/s 速率显示
- 全文件 #if DEBUG 包裹,Release 不打包

MeView 在 DEBUG 时挂 DebugAIRunner 在 placeholder 下方。

下一步用户手动:把 ~/tiji-models/Qwen3-1.7B-4bit 拷到模拟器沙盒
Application Support/Models/ 下,然后跑 App → Me 页点按钮验收。

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

体己/Debug/DebugAIRunner.swift

@@ -0,0 +1,130 @@
+#if DEBUG
+import SwiftUI
+import UIKit
+
+/// DEBUG 自检:加载 LLM 并跑一段 prompt,流式显示 token + 速率。
+/// 同时显示沙盒 Application Support 路径,方便把模型拷进去。
+struct DebugAIRunner: View {
+    @State private var output: String = ""
+    @State private var status: String = "未开始"
+    @State private var rate: Double = 0
+    @State private var running = false
+    @State private var modelReady: Bool = false
+
+    private var appSupportPath: String {
+        (try? FileManager.default.url(
+            for: .applicationSupportDirectory,
+            in: .userDomainMask,
+            appropriateFor: nil,
+            create: false
+        ).path) ?? "(无法获取)"
+    }
+
+    private var modelExpectedPath: String {
+        appSupportPath + "/Models/Qwen3-1.7B-4bit"
+    }
+
+    var body: some View {
+        VStack(alignment: .leading, spacing: 14) {
+            Text("DEBUG · AI 自检")
+                .font(.system(size: 15, weight: .semibold))
+                .foregroundStyle(Tj.Palette.text)
+
+            // 沙盒路径与模型状态卡
+            VStack(alignment: .leading, spacing: 8) {
+                Text("模型预期路径")
+                    .font(.system(size: 11, weight: .medium))
+                    .foregroundStyle(Tj.Palette.text3)
+                Text(modelExpectedPath)
+                    .font(.system(size: 10, design: .monospaced))
+                    .foregroundStyle(Tj.Palette.text2)
+                    .textSelection(.enabled)
+                    .lineLimit(3)
+                HStack(spacing: 8) {
+                    Button("复制路径") {
+                        UIPasteboard.general.string = modelExpectedPath
+                    }
+                    .font(.system(size: 11))
+                    .buttonStyle(.borderless)
+
+                    Spacer()
+
+                    Text(modelReady ? "✓ 模型就绪" : "⚠ 模型未就绪")
+                        .font(.system(size: 11, weight: .medium))
+                        .foregroundStyle(modelReady ? Tj.Palette.leaf : Tj.Palette.brick)
+                }
+            }
+            .padding(10)
+            .background(
+                RoundedRectangle(cornerRadius: 6)
+                    .fill(Color.black.opacity(0.03))
+            )
+
+            // 推理状态
+            HStack {
+                Text("状态:\(status)")
+                Spacer()
+                Text(String(format: "%.1f tok/s", rate))
+                    .foregroundStyle(Tj.Palette.text3)
+                    .monospaced()
+            }
+            .font(.system(size: 12))
+
+            Button(running ? "推理中..." : "跑一段 prompt") {
+                Task { await run() }
+            }
+            .buttonStyle(TjPrimaryButton())
+            .disabled(running)
+
+            ScrollView {
+                Text(output.isEmpty ? "(暂无输出)" : output)
+                    .font(.system(.footnote, design: .monospaced))
+                    .frame(maxWidth: .infinity, alignment: .leading)
+                    .padding(10)
+            }
+            .frame(maxHeight: 240)
+            .background(
+                RoundedRectangle(cornerRadius: 6)
+                    .fill(Color.black.opacity(0.04))
+            )
+        }
+        .padding(16)
+        .background(
+            RoundedRectangle(cornerRadius: Tj.Radius.md)
+                .fill(Color.yellow.opacity(0.08))
+        )
+        .padding(.horizontal, 16)
+        .onAppear { refreshModelStatus() }
+    }
+
+    private func refreshModelStatus() {
+        modelReady = ModelStore.shared.isReady(.llm)
+    }
+
+    @MainActor
+    private func run() async {
+        running = true
+        output = ""
+        rate = 0
+        status = "加载模型..."
+        do {
+            try await AIRuntime.shared.prepare()
+            status = "推理中..."
+
+            let prompt = "用中文一句话介绍肝功能里 ALT 这个指标。"
+            for try await chunk in await AIRuntime.shared.generate(
+                prompt: prompt,
+                maxTokens: 200
+            ) {
+                output += chunk.text
+                rate = chunk.decodeRate
+            }
+            status = "完成 ✓"
+        } catch {
+            status = "失败:\(error.localizedDescription)"
+        }
+        running = false
+        refreshModelStatus()
+    }
+}
+#endif