feat: add examples: form-upload (#5955)

* feat: add examples: form-upload

* fix: upload: accept and label

* fix: upload: 设置表单值、图片预览

playground/src/api/examples/upload.ts

@@ -0,0 +1,25 @@
+import { requestClient } from '#/api/request';
+
+interface UploadFileParams {
+  file: File;
+  onError?: (error: Error) => void;
+  onProgress?: (progress: { percent: number }) => void;
+  onSuccess?: (data: any, file: File) => void;
+}
+export async function upload_file({
+  file,
+  onError,
+  onProgress,
+  onSuccess,
+}: UploadFileParams) {
+  try {
+    onProgress?.({ percent: 0 });
+
+    const data = await requestClient.upload('/upload', { file });
+
+    onProgress?.({ percent: 100 });
+    onSuccess?.(data, file);
+  } catch (error) {
+    onError?.(error instanceof Error ? error : new Error(String(error)));
+  }
+}