实现项目真机预览与待审版本扫码验收

需求：接管客户端未提交 WIP，保留真机预览，移除旧登录原型并维持 2.0.0。

实现：由 Main 核对项目与精确 Release，签发短时 Owner preview；补充一键提交映射能力及 Windows ZIP 预检兼容。

src/lib/device-preview.ts

@@ -0,0 +1,25 @@
+import { hostApiFetch } from '@/lib/host-api';
+import type { DevicePreviewSnapshot } from '../../shared/device-preview';
+
+type DevicePreviewResponse = {
+  success: boolean;
+  preview?: DevicePreviewSnapshot;
+  error?: string;
+};
+
+export class DevicePreviewApiError extends Error {
+  constructor(message: string) {
+    super(message);
+    this.name = 'DevicePreviewApiError';
+  }
+}
+
+export async function fetchProjectDevicePreview(projectId: string): Promise<DevicePreviewSnapshot> {
+  const response = await hostApiFetch<DevicePreviewResponse>(
+    `/api/opencode/projects/${encodeURIComponent(projectId)}/device-preview`,
+  );
+  if (!response.success || !response.preview) {
+    throw new DevicePreviewApiError(response.error || '无法读取真机预览状态');
+  }
+  return response.preview;
+}