feat: 重构为三所价差异动监控系统

删除 HyperLiquid + 全部交易功能，构建自适应 surge 检测器。
- 新增 surge_detector.go: 每币独立滚动窗口基线，检测三所价差异常飙升
- 新增 SpreadCard/SurgeCard 前端组件
- 保留 momentum/trend/cumulative/trend_filter 扫描功能
- 更新文档和配置以反映新系统

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

db/surge_event_repo.go

@@ -0,0 +1,58 @@
+package db
+
+import "time"
+
+// SurgeEventRecord represents a persisted surge detection event.
+type SurgeEventRecord struct {
+	ID              int64   `json:"id"`
+	Coin            string  `json:"coin"`
+	Timestamp       string  `json:"timestamp"`
+	BnPrice         float64 `json:"bn_price"`
+	OkxPrice        float64 `json:"okx_price"`
+	BgPrice         float64 `json:"bg_price"`
+	SpreadPct       float64 `json:"spread_pct"`
+	BaselinePct     float64 `json:"baseline_pct"`
+	ThresholdPct    float64 `json:"threshold_pct"`
+	Ratio           float64 `json:"ratio"`
+	Direction       string  `json:"direction"`
+	LeadingExchange string  `json:"leading_exchange"`
+	MidPrice        float64 `json:"mid_price"`
+	CreatedAt       string  `json:"created_at"`
+}
+
+// InsertSurgeEvent saves a surge event to the database.
+func (d *DB) InsertSurgeEvent(coin string, ts time.Time, bnPrice, okxPrice, bgPrice, spreadPct, baselinePct, thresholdPct, ratio float64, direction, leadingExchange string, midPrice float64) error {
+	_, err := d.Exec(`
+		INSERT INTO surge_events (coin, timestamp, bn_price, okx_price, bg_price, spread_pct, baseline_pct, threshold_pct, ratio, direction, leading_exchange, mid_price, created_at)
+		VALUES (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?)`,
+		coin, ts.Format(time.RFC3339), bnPrice, okxPrice, bgPrice, spreadPct, baselinePct, thresholdPct, ratio, direction, leadingExchange, midPrice, Now().Format(time.RFC3339))
+	return err
+}
+
+// GetSurgeEvents returns surge events ordered by creation time descending.
+func (d *DB) GetSurgeEvents(limit int) ([]SurgeEventRecord, error) {
+	if limit <= 0 {
+		limit = 100
+	}
+	rows, err := d.Query(`
+		SELECT id, coin, timestamp, bn_price, okx_price, bg_price, spread_pct, baseline_pct, threshold_pct, ratio, direction, leading_exchange, mid_price, created_at
+		FROM surge_events
+		ORDER BY created_at DESC
+		LIMIT ?`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+
+	var result []SurgeEventRecord
+	for rows.Next() {
+		var r SurgeEventRecord
+		if err := rows.Scan(&r.ID, &r.Coin, &r.Timestamp, &r.BnPrice, &r.OkxPrice, &r.BgPrice,
+			&r.SpreadPct, &r.BaselinePct, &r.ThresholdPct, &r.Ratio, &r.Direction,
+			&r.LeadingExchange, &r.MidPrice, &r.CreatedAt); err != nil {
+			return nil, err
+		}
+		result = append(result, r)
+	}
+	return result, rows.Err()
+}