完善配送端列表头像展示

frontend/delivery_admin/src/api/avatar.ts

@@ -37,10 +37,14 @@ async function upload(file: File): Promise<AvatarUploadReply> {
 }
 
 /** 读取配送点权限范围内的受保护头像。 */
-async function load(resource: string, identity: string): Promise<Blob | undefined> {
+async function load(
+  resource: string,
+  identity: string,
+  signal?: AbortSignal,
+): Promise<Blob | undefined> {
   const response = await fetch(
     `${deliveryApiBaseURL}${resource}/${encodeURIComponent(identity)}/avatar`,
-    { headers: authorizationHeaders() },
+    { headers: authorizationHeaders(), signal },
   );
   if (response.status === 404) return undefined;
   if (!response.ok) throw new Error('头像读取失败');