🧹 清理重复配置文件

- 删除根目录中重复的 NestJS 配置文件
- 删除 tsconfig.json, tsconfig.build.json, eslint.config.mjs, .prettierrc
- 保留 wwjcloud-nest/ 目录中的完整配置
- 避免配置冲突，确保项目结构清晰

admin-vben/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)));
+  }
+}