增加模型库模型下载入口

web/src/utils/fileDownload.ts

@@ -0,0 +1,28 @@
+export async function downloadFileFromUrl(fileUrl: string, fileName: string) {
+  const response = await fetch(fileUrl, {
+    credentials: "include"
+  });
+  if (!response.ok) {
+    throw new Error(`文件下载失败：${response.status} ${response.statusText}`);
+  }
+
+  const blob = await response.blob();
+  const objectUrl = URL.createObjectURL(blob);
+  try {
+    const anchor = document.createElement("a");
+    anchor.href = objectUrl;
+    anchor.download = ensureGlbFileName(fileName);
+    anchor.rel = "noopener";
+    anchor.style.display = "none";
+    document.body.appendChild(anchor);
+    anchor.click();
+    anchor.remove();
+  } finally {
+    window.setTimeout(() => URL.revokeObjectURL(objectUrl), 1000);
+  }
+}
+
+function ensureGlbFileName(fileName: string) {
+  const name = fileName.trim() || "model.glb";
+  return name.toLowerCase().endsWith(".glb") ? name : `${name}.glb`;
+}