修复模型库空请求体删除失败

web/src/services/api.ts

@@ -6,10 +6,11 @@ function authHeaders(): Record<string, string> {
 }
 
 export async function api<T>(url: string, options: RequestInit = {}): Promise<T> {
+  const hasBody = options.body !== undefined && options.body !== null;
   const response = await fetch(url, {
     ...options,
     headers: {
-      ...(options.body instanceof FormData ? {} : { "Content-Type": "application/json" }),
+      ...(hasBody && !(options.body instanceof FormData) ? { "Content-Type": "application/json" } : {}),
       ...authHeaders(),
       ...((options.headers as Record<string, string> | undefined) ?? {})
     } as HeadersInit
@@ -20,4 +21,3 @@ export async function api<T>(url: string, options: RequestInit = {}): Promise<T>
   }
   return data as T;
 }
-