feat: 趋势过滤信号记录系统 + 实时涨跌方向判断

- 新增 TrendFilter 信号记录（enter/exit），按完整信号和高分信号两档分类
- 信号持久化到 data/trend_signals_cache.json，开机自动恢复
- 新增 /api/trend-signals API + SSE trend_signal 实时广播
- 前端新增完整信号卡片和高分信号卡片，移除旧趋势检测卡片
- 评分加入 1h 涨跌方向和实时 drift 惩罚，下跌币不触发信号
- OKX 交易所支持（累积变动、动量、趋势检测）
- 修复 trend_filter.go 编译错误

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

dashboard.go

@@ -208,9 +208,12 @@ type Dashboard struct {
 
 	// Cumulative tracker (1m/5m multi-exchange consensus)
 	cumulativeTracker *CumulativeTracker
+
+	// Trend filter (K-line based quiet + EMA filter)
+	trendFilter *TrendFilter
 }
 
-func NewDashboard(store *PriceStore, trader *Trader, database *db.DB, addr string, cfg *Config, momentumTracker *MomentumTracker, trendDetector *TrendDetector, cumulativeTracker *CumulativeTracker) *Dashboard {
+func NewDashboard(store *PriceStore, trader *Trader, database *db.DB, addr string, cfg *Config, momentumTracker *MomentumTracker, trendDetector *TrendDetector, cumulativeTracker *CumulativeTracker, trendFilter *TrendFilter) *Dashboard {
 	d := &Dashboard{
 		hub:     NewSSEHub(),
 		history: newPriceHistory(),
@@ -224,6 +227,7 @@ func NewDashboard(store *PriceStore, trader *Trader, database *db.DB, addr strin
 		momentumTracker:   momentumTracker,
 		trendDetector:     trendDetector,
 		cumulativeTracker: cumulativeTracker,
+		trendFilter:       trendFilter,
 	}
 
 	// Wire trend event persistence to SQLite
@@ -235,6 +239,13 @@ func NewDashboard(store *PriceStore, trader *Trader, database *db.DB, addr strin
 		}
 	}
 
+	// Wire trend filter signal broadcast via SSE
+	if trendFilter != nil {
+		trendFilter.OnNewSignal = func(sig TrendSignal) {
+			d.hub.Broadcast("trend_signal", sig)
+		}
+	}
+
 	// Wire cumulative event persistence to SQLite
 	if cumulativeTracker != nil && database != nil {
 		cumulativeTracker.OnEvent = func(ev CmEvent) {
@@ -276,6 +287,7 @@ func (d *Dashboard) Run() {
 	mux.HandleFunc("GET /api/connections", d.handleConnStatus) // P3-5
 	mux.HandleFunc("GET /api/trend-history", d.handleTrendHistory)
 	mux.HandleFunc("GET /api/cm-history", d.handleCmHistory)
+	mux.HandleFunc("GET /api/trend-signals", d.handleTrendSignals)
 	mux.HandleFunc("GET /events", d.handleSSE)
 	mux.HandleFunc("POST /api/stop", d.handleStop)
 	mux.HandleFunc("POST /api/start", d.handleStart)
@@ -597,6 +609,15 @@ func (d *Dashboard) broadcastLoop() {
 				d.hub.Broadcast("cumulative", cmData)
 			}
 		}
+
+		// 8. Trend filter (K-line based quiet + EMA)
+		if d.trendFilter != nil {
+			d.trendFilter.Tick()
+			filterData := d.trendFilter.Snapshot(0)
+			if len(filterData) > 0 {
+				d.hub.Broadcast("trend_filter", filterData)
+			}
+		}
 	}
 }
 
@@ -764,6 +785,17 @@ func (d *Dashboard) handleCmHistory(w http.ResponseWriter, r *http.Request) {
 	writeJSON(w, map[string]interface{}{"events": events})
 }
 
+func (d *Dashboard) handleTrendSignals(w http.ResponseWriter, r *http.Request) {
+	var signals []TrendSignal
+	if d.trendFilter != nil {
+		signals = d.trendFilter.GetSignals(100)
+	}
+	if signals == nil {
+		signals = []TrendSignal{}
+	}
+	writeJSON(w, map[string]interface{}{"signals": signals})
+}
+
 func (d *Dashboard) handleTrades(w http.ResponseWriter, r *http.Request) {
 	if d.db == nil {
 		writeJSON(w, map[string]interface{}{"trades": []interface{}{}, "total": 0})