feat: serialize public hardware execution

apps/web-console/app.js

@@ -2790,8 +2790,11 @@ async function loadRuntime() {
     const profileText = (hardware.firmware_profiles || []).join(" / ") || "未选择 profile";
     const flashText = hardware.auto_flash_enabled ? "自动烧录已启用" : "自动烧录未启用";
     const approvalText = hardware.approval_required ? "需授权令牌" : "调试免令牌";
+    const concurrencyText = hardware.concurrency_policy === "single_flight_fail_fast"
+      ? " · 单请求独占"
+      : "";
     $("#hardwareNote").textContent = hardware.configured
-      ? `${hardware.backend} · ${hardware.bitrate / 1000} kbit/s · ${profileText} · ${flashText} · ${approvalText}`
+      ? `${hardware.backend} · ${hardware.bitrate / 1000} kbit/s · ${profileText} · ${flashText} · ${approvalText}${concurrencyText}`
       : `真实执行已锁定：${profileText}；请完成服务端启用、适配器、固件镜像${hardware.approval_required ? "和令牌" : ""}配置`;
     $("#hardwareAliasNote").textContent = "副驾座椅 → t2g_primary_seat（统一电机、加热和通风执行器）";
     $("#autoFlashNote").textContent = hardware.auto_flash_enabled
@@ -2802,7 +2805,7 @@ async function loadRuntime() {
       ? '<i data-lucide="shield-check"></i>硬件已配置'
       : '<i data-lucide="shield-off"></i>硬件锁定';
     $("#hardwareCoverage").textContent = hardware.configured
-      ? `可选 · ${approvalText}`
+      ? `可选 · ${approvalText}${concurrencyText}`
       : "已阻断";
     $("#hardwareCoverage").className = hardware.configured ? "available" : "blocked";
     const modeAvailable = state.executionMode === "hardware"
@@ -3684,7 +3687,14 @@ async function submitRequest(event) {
       window.location.replace("/login");
       return;
     }
-    if (!response.ok) throw new Error(payload.message || payload.error || `HTTP ${response.status}`);
+    if (!response.ok) {
+      const requestError = new Error(payload.message || payload.error || `HTTP ${response.status}`);
+      requestError.code = payload.error;
+      requestError.retryAfter = Number(
+        payload.retry_after_seconds || response.headers.get("Retry-After") || 0,
+      );
+      throw requestError;
+    }
     renderResult(payload);
     if (state.executionMode === "hardware") {
       await synchronizePhysicalSeatState();
@@ -3701,9 +3711,16 @@ async function submitRequest(event) {
   } catch (error) {
     window.clearInterval(state.progressTimer);
     resetPipeline();
-    setRunStatus("failed", "FAILED");
-    $("#resultTitle").textContent = "请求处理失败";
-    showToast(error.message);
+    if (error.code === "hardware_busy") {
+      setRunStatus("failed", "BENCH BUSY");
+      $("#resultTitle").textContent = "真实台架正在使用";
+      const retryHint = error.retryAfter > 0 ? ` 建议 ${error.retryAfter} 秒后重试。` : "";
+      showToast(`${error.message}${retryHint}`);
+    } else {
+      setRunStatus("failed", "FAILED");
+      $("#resultTitle").textContent = "请求处理失败";
+      showToast(error.message);
+    }
   } finally {
     button.disabled = false;
     button.classList.remove("loading");