docs(changelog): 补登记 #320 / #321 条目

[modusensus]

合并后的账目补齐：#320（巩固错峰队列 + peak-hours.js 抽模块）此前整份缺条目；#321（issue 模板三件套）补一行。纯 CHANGELOG，零代码。

Summary by CodeRabbit

• 新功能
  • 高峰时段会暂缓模型调用并记录跳过情况，之后择时补跑；延期最长为 120 分钟，超过上限后任务照常运行。
  • 新增双语 Bug 与功能请求表单，收集环境信息，并引导用户将空白问题转至 Discussions 或通过私密安全通告提交。
• 文档
  • 更新功能请求指引，说明实现范围并提供 AI 使用披露自查提示。

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• dsh-mneme/CHANGELOG.md

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< I don't chase bugs; they surrender. >
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