完善测试：pytest 套件（路由器/工具循环/WS全链路/投递/PG集成）

- tests/conftest.py: 内存版 FakeDB 复刻 db.py 全部签名，绕过 lifespan 的测试应用
- test_chat_flow.py: WebSocket 全链路（回声/路由信号落库/档案/慢信/连续天数）
- test_delivery.py: 事件/每日任务/关怀投递（在线与离线）、天气工具城市链、system prompt 注入
- test_router.py: 小模型路由清洗（去重/丢过去事件/非法作息/500优雅降级/无模型空判定）
- test_tool_loop.py: 原生工具调用循环（喂结果/超轮次强制收尾/坏参数）
- test_pure.py: 纯逻辑（连续天数/哈希槽位/时间间隔/模板/向量）
- test_db_pg.py: PG 集成测试，无 PG_DSN 自动跳过，配好即真实跑库
- 旧散装脚本移除；tools_live/ws_client/tui_smoke 保留为手动脚本

uv.lock

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