Add basic.sendReasoning toggle to suppress thinking-process forwarded messages for @/prefix-triggered chat

[Copilot]

@-mention and command-prefix triggered conversations unconditionally forwarded the model's reasoning content as a merged message (see screenshot). bym mode already had bym.sendReasoning for this; normal chat mode had no equivalent.

Changes

• config/config.js — add basic.sendReasoning: true (defaults true, no behaviour change for existing users)
• apps/chat.js — gate reasoning forward replies on Config.basic.sendReasoning:

  if (Config.basic.sendReasoning) {
    for (let forwardElement of forward) {
      this.reply(forwardElement)
    }
  }

• guoba.support.js — reverted to original state; the file is no longer used in the current version

Original prompt

---

This section details on the original issue you should resolve

<issue_title>关于@触发对话会转发思考的问题</issue_title>
<issue_description>如题，现在@或者指令前缀触发对话后，会合成一条转发消息用来转发思考过程，但伪人模式在管理面板中拥有独立的开关来选择是否转发该消息。希望能在管理面板中也增加一个使用@或者指令前缀触发对话时，是否转发思考过程的开关。或者是有其他指令可以关闭该过程。

</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes 关于@触发对话会转发思考的问题 #828

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[ikechan8370]

please revert the changes of guoba.support.js which is not available in the current version.