docs: 文档清理与重构 — 统一为 3 个核心文档

- 删除 5 个过时/残留文档(project_plan/agent_prompt/optimization_plan/report_db_design/deploy/README)
- 新建 docs/architecture.md(项目架构:11 包职责+数据模型+配置+产物)
- 重写 docs/user-guide.md(CLI 全量+增量/断点续跑+MCP+FAQ)
- 重写 README.md(精简入口+文档索引)
- 更新 continuation.md(追加本次记录)
- 更新 .gitignore(排除 data/* 运行产物)

deploy/a-share-research.service

@@ -0,0 +1,24 @@
+[Unit]
+Description=A 股 Deep Research 定时调度
+After=network-online.target
+Wants=network-online.target
+
+[Service]
+Type=simple
+User=pi
+Group=pi
+WorkingDirectory=/home/pi/cc-projects/news
+ExecStart=/home/pi/cc-projects/news/.venv/bin/python -m scripts.run_scheduler
+Restart=always
+RestartSec=30
+
+# 日志
+StandardOutput=append:/home/pi/cc-projects/news/logs/scheduler-stdout.log
+StandardError=append:/home/pi/cc-projects/news/logs/scheduler-stderr.log
+
+# 环境变量
+Environment="PATH=/home/pi/cc-projects/news/.venv/bin:/usr/local/bin:/usr/bin:/bin"
+Environment="TZ=Asia/Shanghai"
+
+[Install]
+WantedBy=multi-user.target