Bun HTTP 服务器文件上传示例——AI 生成提示词

Create a single-file Bun HTTP server (index.ts) that:
- Serves static files from './public' folder (e.g., index.html)
- Handles POST /upload to save uploaded files to './uploads' folder (use multipart form data)
- Uses Bun's built-in fetch API and serve()
- Returns a JSON response with filename and size on upload success
- Has a simple HTML frontend (served as static) with a drag-and-drop file upload zone and a list of uploaded files (fetched via GET /files)
- Include a simple GET /files endpoint that returns a JSON array of uploaded filenames
- Use minimal styling (inline CSS) for a clean, modern look
- Use only Bun standard library, no npm packages.