fix: 修复 SuperGrok 付费账号多Agent模型空响应问题#406
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- 新增 modeId 映射替代旧的 modelName/modelMode 请求格式
（Grok API 要求付费账号多智能体管线使用 modeId 字段）
- 移除已废弃的 enable420 标志
- 修复 think_closed_once 门控导致多智能体思维链 token 被丢弃的问题
- 使用 messageStepId 将 Agent 思考聚合到单个 <think> 块
- 丢弃正文输出中途插入的孤儿思考 token（Grok 官网也隐藏这部分）
- CollectProcessor 添加 fallback token 收集兜底非流式模式
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Summary
修复 SuperGrok 付费账号使用多Agent模型（grok-4.20-beta、grok-4.1-mini、grok-4.1-thinking）时返回空响应的问题。根因是 Grok API 已迁移到
modeId字段，付费账号的多Agent管线需要此字段才能正常初始化；同时think_closed_once门控在多 Agent场景下错误丢弃了思维链和正文内容。Changes
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