trend_detector + xiaoguo_news_processor 全链路

- trend_detector.py: 6类信号检测（资金异动/涨跌比反转/领涨更替/趋势拐点/量价背离/普涨背离）
- xiaoguo_news_processor.py: akshare搜新闻+小果LLM情感分析
- mofin_db.py: 新增 sector_signals + signal_news 两张表
- 文档更新：新增第四章实时信号检测与小果情报处理
- 测试结果：趋势检测已通过，信号写入正常

mofin_db.py

@@ -291,6 +291,36 @@ def init_all_tables(conn: sqlite3.Connection):
             created_at      TEXT DEFAULT (datetime('now','localtime'))
         );
         CREATE INDEX IF NOT EXISTS idx_feedback_code ON strategy_feedback(code);
+
+        -- 板块信号（trend_detector 产出）
+        CREATE TABLE IF NOT EXISTS sector_signals (
+            id              INTEGER PRIMARY KEY AUTOINCREMENT,
+            signal_type     TEXT NOT NULL,
+            sector          TEXT NOT NULL,
+            severity        TEXT DEFAULT 'medium',
+            related_stocks  TEXT,
+            holdings_in_sector TEXT,
+            watchlist_in_sector TEXT,
+            trigger_reason  TEXT,
+            snapshot_id     INTEGER,
+            processed       INTEGER DEFAULT 0,
+            detected_at     TEXT DEFAULT (datetime('now','localtime'))
+        );
+        CREATE INDEX IF NOT EXISTS idx_signal_processed ON sector_signals(processed);
+        CREATE INDEX IF NOT EXISTS idx_signal_sector ON sector_signals(sector);
+
+        -- 小果情报（xiaoguo_news_processor 产出）
+        CREATE TABLE IF NOT EXISTS signal_news (
+            id              INTEGER PRIMARY KEY AUTOINCREMENT,
+            signal_id       INTEGER REFERENCES sector_signals(id),
+            sector          TEXT NOT NULL,
+            overall_sentiment TEXT,
+            summary         TEXT,
+            key_articles    TEXT,
+            searched_stocks TEXT,
+            created_at      TEXT DEFAULT (datetime('now','localtime'))
+        );
+        CREATE INDEX IF NOT EXISTS idx_signal_news_signal ON signal_news(signal_id);
     """)
     conn.commit()