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>

cumulative.go

@@ -27,8 +27,6 @@ func shortExName(name string) string {
 	switch name {
 	case ExBitget:
 		return "bg"
-	case ExHyperLiquid:
-		return "hl"
 	case ExBinance:
 		return "bn"
 	case ExOKX:
@@ -459,7 +457,7 @@ func (ct *CumulativeTracker) makeEvent(coin, prevState, newState, direction stri
 		ExAgree:    exAgree,
 		ExTotal:    exTotal,
 		BGChange1m: exChanges[ExBitget],
-		HLChange1m: exChanges[ExHyperLiquid],
+		HLChange1m: 0,
 		BNChange1m: exChanges[ExBinance],
 		OKXChange1m: exChanges[ExOKX],
 		Timestamp:  time.Now().UnixMilli(),