refactor(annotation): 简化注释数据导出下载逻辑

- 移除前端手动创建 a 标签下载文件的方式
- 将文件名参数传递给后端 API 函数
- 利用 download 函数内置的下载处理机制
- 简化 ExportAnnotationDialog 组件中的导出流程
- 更新 annotation.api.ts 中的 downloadAnnotationsUsingGet 函数签名
- 直接通过 API 调用完成文件下载和命名

frontend/src/pages/DataAnnotation/Home/ExportAnnotationDialog.tsx

@@ -106,13 +106,6 @@ export default function ExportAnnotationDialog({
       const values = await form.validateFields();
       setExporting(true);
 
-      const blob = await downloadAnnotationsUsingGet(
-        projectId,
-        values.format,
-        values.onlyAnnotated,
-        values.includeData
-      );
-
       // 获取文件名
       const formatExt: Record<ExportFormat, string> = {
         json: "json",
@@ -124,15 +117,14 @@ export default function ExportAnnotationDialog({
       const ext = formatExt[values.format as ExportFormat] || "json";
       const filename = `${projectName}_annotations.${ext}`;
 
-      // 下载文件
-      const url = window.URL.createObjectURL(blob as Blob);
-      const a = document.createElement("a");
-      a.href = url;
-      a.download = filename;
-      document.body.appendChild(a);
-      a.click();
-      window.URL.revokeObjectURL(url);
-      document.body.removeChild(a);
+      // 下载文件（download函数内部已处理下载逻辑）
+      await downloadAnnotationsUsingGet(
+        projectId,
+        values.format,
+        values.onlyAnnotated,
+        values.includeData,
+        filename
+      );
 
       message.success("导出成功");
       onClose();

frontend/src/pages/DataAnnotation/annotation.api.ts

@@ -109,12 +109,13 @@ export function downloadAnnotationsUsingGet(
   projectId: string,
   format: ExportFormat = "json",
   onlyAnnotated: boolean = true,
-  includeData: boolean = false
+  includeData: boolean = false,
+  filename?: string
 ) {
   const params = new URLSearchParams({
     format,
     only_annotated: String(onlyAnnotated),
     include_data: String(includeData),
   });
-  return download(`/api/annotation/export/projects/${projectId}/download?${params.toString()}`);
+  return download(`/api/annotation/export/projects/${projectId}/download?${params.toString()}`, null, filename);
 }