feat: 新增限流功能 (#718)

* 请求速率限制

* perf: 优化代码

---------

Co-authored-by: ChenZhaoYu <790348264@qq.com>

service/src/index.ts

@@ -2,6 +2,7 @@ import express from 'express'
 import type { ChatContext, ChatMessage } from './chatgpt'
 import { chatConfig, chatReplyProcess, currentModel } from './chatgpt'
 import { auth } from './middleware/auth'
+import { limiter } from './middleware/limiter'
 import { isNotEmptyString } from './utils/is'
 
 const app = express()
@@ -17,7 +18,7 @@ app.all('*', (_, res, next) => {
   next()
 })
 
-router.post('/chat-process', auth, async (req, res) => {
+router.post('/chat-process', [auth, limiter], async (req, res) => {
   res.setHeader('Content-type', 'application/octet-stream')
 
   try {