feat: 添加OKX行情接入+趋势检测+累积变动系统+界面重构

- 新增OKX WebSocket行情连接器，扩展4交易所价格监控
- 新增z-score趋势检测引擎(TrendDetector)，识别价格异动/趋势启动
- 新增累积变动跟踪(CumulativeTracker)，基于1min/5min多交易所共识
- 趋势事件和累积变动事件持久化到SQLite
- 新增Binance/OKX动量检测字段，扩展前端动量卡片至15列
- 迁移至macOS(darwin-arm64)，更新前端依赖
- Dashboard网格重构：非交易卡片置顶，交易卡片置底
- TrackedCoin添加OK字段，添加ExBinance/ExOKX常量
- 前端新增趋势检测卡片、趋势历史卡片、累积变动卡片

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

db/db.go

@@ -108,6 +108,48 @@ func (d *DB) migrate() error {
 		created_at     DATETIME NOT NULL
 	);
 	CREATE INDEX IF NOT EXISTS idx_system_orders_trade ON system_orders(trade_id);
+
+	CREATE TABLE IF NOT EXISTS trend_events (
+		id         INTEGER PRIMARY KEY AUTOINCREMENT,
+		coin       TEXT NOT NULL,
+		prev_state TEXT NOT NULL,
+		new_state  TEXT NOT NULL,
+		direction  TEXT NOT NULL,
+		z_score    REAL,
+		volatility REAL,
+		bg_change  REAL,
+		hl_change  REAL,
+		bn_change  REAL,
+		okx_change REAL,
+		ex_agree   INTEGER,
+		ex_total   INTEGER,
+		created_at DATETIME NOT NULL
+	);
+	CREATE INDEX IF NOT EXISTS idx_trend_events_coin   ON trend_events(coin);
+	CREATE INDEX IF NOT EXISTS idx_trend_events_created ON trend_events(created_at);
+
+	CREATE TABLE IF NOT EXISTS cm_events (
+		id         INTEGER PRIMARY KEY AUTOINCREMENT,
+		coin       TEXT NOT NULL,
+		prev_state TEXT NOT NULL,
+		new_state  TEXT NOT NULL,
+		direction  TEXT NOT NULL,
+		score      REAL,
+		avg_change REAL,
+		ex_agree   INTEGER,
+		ex_total   INTEGER,
+		bg_1m      REAL,
+		hl_1m      REAL,
+		bn_1m      REAL,
+		okx_1m     REAL,
+		bg_5m      REAL,
+		hl_5m      REAL,
+		bn_5m      REAL,
+		okx_5m     REAL,
+		created_at DATETIME NOT NULL
+	);
+	CREATE INDEX IF NOT EXISTS idx_cm_events_coin   ON cm_events(coin);
+	CREATE INDEX IF NOT EXISTS idx_cm_events_created ON cm_events(created_at);
 	`
 	_, err := d.Exec(schema)
 	if err != nil {