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/cm_event_repo.go

@@ -0,0 +1,65 @@
+package db
+
+import (
+	"time"
+)
+
+// CmEventRecord represents a persisted cumulative move state transition.
+type CmEventRecord struct {
+	ID        int64   `json:"id"`
+	Coin      string  `json:"coin"`
+	PrevState string  `json:"prev_state"`
+	NewState  string  `json:"new_state"`
+	Direction string  `json:"direction"`
+	Score     float64 `json:"score"`
+	AvgChange float64 `json:"avg_change"`
+	ExAgree   int     `json:"ex_agree"`
+	ExTotal   int     `json:"ex_total"`
+	BG1m      float64 `json:"bg_1m"`
+	HL1m      float64 `json:"hl_1m"`
+	BN1m      float64 `json:"bn_1m"`
+	OKX1m     float64 `json:"okx_1m"`
+	BG5m      float64 `json:"bg_5m"`
+	HL5m      float64 `json:"hl_5m"`
+	BN5m      float64 `json:"bn_5m"`
+	OKX5m     float64 `json:"okx_5m"`
+	CreatedAt string  `json:"created_at"`
+}
+
+// InsertCmEvent saves a cumulative move event to the database.
+func (d *DB) InsertCmEvent(coin, prevState, newState, direction string, score, avgChange float64, exAgree, exTotal int, bg1m, hl1m, bn1m, okx1m, bg5m, hl5m, bn5m, okx5m float64) error {
+	_, err := d.Exec(`
+		INSERT INTO cm_events (coin, prev_state, new_state, direction, score, avg_change, ex_agree, ex_total, bg_1m, hl_1m, bn_1m, okx_1m, bg_5m, hl_5m, bn_5m, okx_5m, created_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		coin, prevState, newState, direction, score, avgChange, exAgree, exTotal, bg1m, hl1m, bn1m, okx1m, bg5m, hl5m, bn5m, okx5m, Now().Format(time.RFC3339))
+	return err
+}
+
+// GetCmEvents returns cumulative move events ordered by creation time descending.
+func (d *DB) GetCmEvents(limit int) ([]CmEventRecord, error) {
+	if limit <= 0 {
+		limit = 100
+	}
+	rows, err := d.Query(`
+		SELECT id, coin, prev_state, new_state, direction, score, avg_change, ex_agree, ex_total, bg_1m, hl_1m, bn_1m, okx_1m, bg_5m, hl_5m, bn_5m, okx_5m, created_at
+		FROM cm_events
+		ORDER BY created_at DESC
+		LIMIT ?`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var result []CmEventRecord
+	for rows.Next() {
+		var r CmEventRecord
+		if err := rows.Scan(&r.ID, &r.Coin, &r.PrevState, &r.NewState, &r.Direction,
+			&r.Score, &r.AvgChange, &r.ExAgree, &r.ExTotal,
+			&r.BG1m, &r.HL1m, &r.BN1m, &r.OKX1m,
+			&r.BG5m, &r.HL5m, &r.BN5m, &r.OKX5m, &r.CreatedAt); err != nil {
+			return nil, err
+		}
+		result = append(result, r)
+	}
+	return result, rows.Err()
+}