fix multiple chunk data concatenated

[nephen]

看起来是数据没有接收完整，就拿来解析了，所以判断解析失败时，干脆重新读取数据进行重试了。

go-chatgpt-api          | INFO[0833] {"message": {"id": "eb527d07-dd7a-4fa4-a920-083994b9b5ca", "author": {"role": "assistant", "name": null, "metadata": {}}, "create_time": 1681030026.950957, "update_time": null, "content": {"content_type": "text", "parts": ["\u5728 Vue \u4e2d\u5b9e\u73b0\u8f93\u5165\u6846\u7f13\u5b58\uff0c\u53ef\u4ee5\u901a\u8fc7\u4ee5\u4e0b\u6b65\u9aa4\uff1a\n\n1. \u5728\u9875\u9762\u521d\u59cb\u5316\u65f6\uff0c\u901a\u8fc7 localStorage \u6216 sessionStorage \u83b7\u53d6\u8f93\u5165\u6846\u7684\u503c\u3002\n\n2. \u5c06\u8f93\u5165\u6846\u7684\u503c\u7ed1\u5b9a\u5230 data \u4e2d\u7684\u53d8\u91cf\u3002\n\n3. \u76d1\u542c\u8f93\u5165\u6846\u7684 input \u4e8b\u4ef6\uff0c\u6bcf\u6b21\u8f93\u5165\u6846\u7684\u503c\u53d1\u751f\u53d8\u5316\u65f6\uff0c\u5c06\u503c\u66f4\u65b0\u5230 data \u4e2d\u7684\u53d8\u91cf\uff0c\u5e76\u5c06\u53d8\u91cf\u7684\u503c\u4fdd\u5b58\u5230 localStorage \u6216 sessionStorage \u4e2d\u3002\n\n\u4ee5\u4e0b\u662f\u4e00\u4e2a\u7b80\u5355\u7684\u793a\u4f8b\uff1a\n\n```\n<template>\n  <div>\n    <input type=\"text\" v-model=\"inputValue\" @input=\"handleInput\" />\n  </div>\n</template>\n\n<script>\nexport default {\n  data() {\n    return {\n
go-chatgpt-api          | ERRO[0833] unexpected end of JSON input