优化文件流处理，添加对 Bun 环境的支持，重构管道传输函数，改进内容类型获取逻辑

src/modules/fm-manager/utils.ts

@@ -1,6 +1,12 @@
 import { IncomingMessage } from 'node:http';
 import http from 'node:http';
 import { logger } from '../logger.ts';
+export const isBun = typeof Bun !== 'undefined' && Bun?.version != null;
+
+export const isNode = typeof process !== 'undefined' && process?.versions != null && process.versions?.node != null;
+
+// @ts-ignore
+export const isDeno = typeof Deno !== 'undefined' && Deno?.version != null && Deno?.version?.deno != null;
 
 export const getUserFromRequest = (req: IncomingMessage) => {
   const url = new URL(req.url, `http://${req.headers.host}`);