完善生图5.0的功能

lib/client/asset-urls.ts

@@ -2,10 +2,20 @@ export function assetPreviewUrl(asset: { id: string }) {
   return `/api/assets/${encodeURIComponent(asset.id)}/download?inline=1`;
 }
 
+// Binary reads stay on the application origin so browser fetch/canvas callers
+// do not follow a private-OSS preview redirect and require bucket CORS access.
+export function assetContentUrl(asset: { id: string }) {
+  return `/api/assets/${encodeURIComponent(asset.id)}/download`;
+}
+
 export function materialPreviewUrl(material: { id?: string; url: string }) {
   return material.id ? assetPreviewUrl({ id: material.id }) : material.url;
 }
 
+export function materialContentUrl(material: { id?: string; url: string }) {
+  return material.id ? assetContentUrl({ id: material.id }) : material.url;
+}
+
 export function storedAssetPreviewUrl(url: string | undefined, assets: Array<{ id: string; url: string }>) {
   if (!url) return "";
   const asset = assets.find((item) => item.url === url);