add tool calling, SQLite persistence, group chat, image vision, voice transcription

Major features:
- OpenAI function calling with tool call loop (streaming SSE parsing)
- Built-in tools: spawn_agent (async claude -p), agent_status, kill_agent,
  update_scratch, send_file
- Script-based tool discovery: tools/ dir with --schema convention
- Feishu todo management script (tools/manage_todo)
- SQLite persistence: conversations, messages, config, scratch_area tables
- Sliding window context (100 msgs, slide 50, auto-summarize)
- Conversation summary generation via LLM on window slide
- Group chat support with independent session contexts
- Image understanding: multimodal vision input (base64 to API)
- Voice transcription via faster-whisper Docker service
- Configurable persona stored in DB
- diag command for session diagnostics
- System prompt restructured: persona + tool instructions separated
- RUST_BACKTRACE=1 in service, clippy in deploy pipeline
- .gitignore for config/state/db files

doc/todo.md

@@ -1,10 +1,44 @@
-# TODO
+# noc roadmap
 
-- [ ] Streaming responses — edit message as claude output arrives instead of waiting for full completion
-- [ ] Markdown formatting — parse claude output and send with TG MarkdownV2
-- [ ] Timeout handling — kill claude if it hangs beyond a threshold
-- [ ] Graceful shutdown on SIGTERM
-- [ ] `/reset` command to force new session without waiting for 5am
-- [ ] Rate limiting per chat
-- [ ] Voice message support — STT (whisper.cpp) → text → claude
-- [ ] Video/audio file transcription
+## "会呼吸的助手" — 让 noc 活着
+
+核心理念：noc 不应该只在收到消息时才被唤醒，而是一个持续运行、有自己节奏的存在。
+
+### 主动行为
+- [ ] 定时任务 (cron)：LLM 可以自己设置提醒、定期检查
+- [ ] 事件驱动：监控文件变化、git push、CI 状态等，主动通知
+- [ ] 晨间/晚间报告：每天自动汇总待办、提醒重要事项
+- [ ] 情境感知：根据时间、地点、日历自动调整行为
+
+### 记忆与成长
+- [ ] 长期记忆 (MEMORY.md)：跨 session 的持久化记忆
+- [ ] 语义搜索：基于 embedding 的记忆检索
+- [ ] 自我反思：定期回顾对话质量，优化自己的行为
+
+### 感知能力
+- [x] 图片理解：multimodal vision input
+- [ ] 语音转录：whisper API 转文字
+- [ ] 屏幕/截图分析
+- [ ] 链接预览/摘要
+
+### 交互体验
+- [x] 群组支持：独立上下文
+- [x] 流式输出：sendMessageDraft + editMessageText
+- [x] Markdown 渲染
+- [ ] Typing indicator
+- [ ] Inline keyboard 交互
+- [ ] 语音回复 (TTS)
+
+### 工具生态
+- [x] 脚本工具发现 (tools/ + --schema)
+- [x] 异步子代理 (spawn_agent)
+- [x] 飞书待办管理
+- [ ] Web search / fetch
+- [ ] 更多脚本工具
+- [ ] MCP 协议支持
+
+### 可靠性
+- [ ] API 重试策略 (指数退避)
+- [ ] 用量追踪
+- [ ] Context pruning (只裁工具输出)
+- [ ] Model failover