fix: hide image count selector when only one output is allowed

components/image-params-bar.tsx

@@ -138,6 +138,7 @@ export function ImageParamsBar({
   });
 
   const imageCountOptions = getImageCountOptions();
+  const showImageCountSelector = !hideImageCount && imageCountOptions.length > 1;
   
   // 是否显示阿里生图专用参数
   const isAlibabaImage = providerType === "alibaba-image";
@@ -224,7 +225,7 @@ export function ImageParamsBar({
           </DropdownMenuContent>
         </DropdownMenu>
 
-        {!hideImageCount && (
+        {showImageCountSelector && (
           <DropdownMenu>
             <DropdownMenuTrigger asChild>
               <Button variant="ghost" className="h-8 px-2 gap-1 focus-visible:ring-0 focus-visible:ring-offset-0 focus:outline-none focus:ring-0">