[quiz] feat: 会话总结一键出题 + 聊天 "/" 命令栏与 skills 强制注入（含 frontendv2） - #80
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- prompts.py: 回答规范第4条改为「总述+分点展开+收尾」结构要求，新增详尽度 ❌/✅ 对照示例；寒暄类保持简洁 - main.py: harness LLM temperature 0 → 0.4（输出更舒展；LLM 为全部 agent 共享） - vector_search.py: 默认 k 5→8、每视频展示 chunk 上限 3→6，工具描述引导深度问题用 k=10-15（RAGService over-recall≥30，放大 k 安全）
会话总结出题（非定时）： - POST /quiz/generate-from-summary：会话归属/消息/Agent 在线预检 + 配额，建 quiz_sets 行（source_type=session_summary）后 BackgroundTasks 生成 - services/quiz_from_summary.py：get_or_create_summary 复用/自动生成总结并持久化（与总结弹窗共享同一份）→ 总结切伪 chunk → 复用 quiz agent 的 generate_questions → 落库现有 quiz_sets/quiz_questions，答题/批改/错题本全复用 - session_summary.py：抽出共享持久化 _insert_summary_record + 非流式 get_or_create_summary - models.py/system.sql：quiz_sets 加 nullable chat_session_id（MySQL 附加列，无 Milvus 影响） skills 强制注入（按请求，Claude Code 式）： - ChatRequest.skill_ids（≤10）→ dispatcher 透传 → ChatAgentState → inject_context 并发加载全文 → system prompt 新增「用户指定技能」区块；未安装跳过告警 配额两阶段修复（用量统计不准）： - quiz_quota 新增 check_quota（peek 不消耗）；两个出题端点改为 peek→建行→consume：被拒不建行不扣额、建行失败不烧配额、竞态容忍 自动迁移补登： - database.py 迁移列表登记 quiz_sets.chat_session_id + _ensure_index 索引（存量库重启自动补齐，幂等） frontendv2： - slash-menu.tsx：Codex 风格命令栏（命令/Skills 两组，↑↓/Enter/Tab/Esc，Skills 多选） - chat-input.tsx："/" 触发+过滤+键盘拦截、已选 skills chips、发送携带 skill_ids（仅单条消息生效） - quiz-from-summary-dialog.tsx：配置→轮询→成功跳题库向导；quiz-view 支持 ?quiz= 深链 - lib/api：chat.ts 加 skill_ids、quiz.ts 加 generateFromSummary 测试：test_quiz_from_summary.py 27 例（chunk 切分/题型分布/总结复用/预检/透传/配额顺序）；ruff 全绿
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概述
两个功能 + 两组配套修复，共 2 个提交：
POST /quiz/generate-from-summary：基于会话总结出题，无总结时自动生成并持久化（与总结弹窗共享同一份）；题目复用 quiz agent 的generate_questions，落库现有 quiz_sets/quiz_questions，答题/批改/错题本全复用配套修复
quiz_sets.chat_session_id补登进database.py _migrate_add_columns+ 索引 ensure（存量库重启自动补齐，已对真实库验证幂等；之前线上 1054 即缺此登记）quiz_quota新增 peek 式check_quota；两个出题端点改为 peek→建行→consume——被拒不建行不扣额、建行失败不烧配额、竞态容忍数据库变更
quiz_sets新增 nullablechat_session_id VARCHAR(64)+ 索引（MySQL 附加列，无 Milvus 影响；system.sql 已同步，启动自动迁移已登记）测试
test_quiz_from_summary.py27 例：伪 chunk 切分 / 题型分布 / get_or_create_summary 复用路径 / 预检 404/400/503 / dispatcher skill_ids 透传 / 配额 peek 语义与路由顺序ruff check app/全绿；frontendv2tsc --noEmit+next build通过