caoqianming d1a2961bf4 api+ui(dev SPA): POST /v1/tasks/{id}/clear 清空对话 + 顶栏「清空对话」按钮 ... - 后端: 同事务 SELECT FOR UPDATE 锁 + active run 检查(running/cancelling → 409) + DELETE messages + reset tasks.tokens_prompt/completion/cost_usd=0 + run_status='idle' - usage_events 完全不动 — 用户级账单 source of truth 与对话清空解耦; message_id FK 是 ondelete=SET NULL,task_id/units/cost_usd 全保留可重建累计 - dev SPA 顶栏在导出后插「清空对话」(紫色 hover,介于完成绿/废弃橙/删除红), running||n_messages==0 → disabled,confirm 二次确认 + 同步刷新 chat-meta / 消息 / 任务列表 - FS 文件保留(沿用 task delete 的"FS 视图可重生"心智) - RUN.md API 表 + 故障兜底加 409 case;DESIGN.md 不动(无架构 / schema 字段语义变化) Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>		2026-05-20 14:19:08 +08:00
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vendor	vendor(office preview): jszip 3.10.1 + docx-preview 0.3.6 + xlsx 0.18.5	2026-05-19 08:25:07 +08:00
dev.html	api+ui(dev SPA): POST /v1/tasks/{id}/clear 清空对话 + 顶栏「清空对话」按钮	2026-05-20 14:19:08 +08:00