全面移除JSON数据源 移至mo_data/DB

- 宏观风险扫描(3个cron): portfolio.json -> mo_data.read_portfolio()
- 小果情感分析: decisions/portfolio.json -> mo_data read+write xiaoguo_insights.json
- 芯碁微装监控: decisions.json -> mo_data.read_decisions()
- 开盘/收盘简报: 去掉portfolio.json/decisions.json/watchlist.json文件读取，全部从mo_data
- 系统健康检查: 仅保留文件存在性检查，数据从DB
- 知识萃取: stale_staleness_report.json/decisions.json注入改为context注入

数据管道稳定：唯一入口price_monitor -> DB -> mo_data读 -> LLM cron输出

data/price_events.json

@@ -8289,6 +8289,26 @@
       "event_label": "买入区间",
       "timestamp": "2026-07-03T10:18:53.447704",
       "date": "2026-07-03"
+    },
+    {
+      "code": "001309",
+      "name": "德明利",
+      "event_type": "entry_zone",
+      "price": 835.99,
+      "trigger_value": "818.3~838.69",
+      "event_label": "买入区间",
+      "timestamp": "2026-07-03T10:20:24.878817",
+      "date": "2026-07-03"
+    },
+    {
+      "code": "600519",
+      "name": "贵州茅台",
+      "event_type": "entry_zone",
+      "price": 1202.41,
+      "trigger_value": "1179.92~1206.14",
+      "event_label": "买入区间",
+      "timestamp": "2026-07-03T10:20:24.988282",
+      "date": "2026-07-03"
     }
   ]
 }