feat(通知模板): 支持缺字段按空值渲染与空行省略

Motivation:
统一 crypto-strategy 与 trade-signal 两类交易信号的模板字段，使同一套通知模板可复用；字段缺失或为空时不再导致渲染报错或输出空行，通知内容更整洁。

Changes:

* 渲染器缺失字段改为按空值处理，新增 line 函数实现空值整行省略
* crypto-strategy 信号补充止盈价、止损价、平均价、收益额等模板字段
* trade-signal 信号保留原始报文中的额外字段以适配统一模板
* 修复结构化日志将 error 作为值直接输出导致的格式问题

internal/subscriber/cryptostrategy/convert.go

@@ -35,6 +35,7 @@ type payload struct {
 
 type remark struct {
 	OrderID string `json:"orderId"`
+	Revenue string `json:"revenue"`
 }
 
 type Converter struct{}
@@ -60,31 +61,39 @@ func Convert(body []byte) (string, map[string]interface{}, error) {
 	text := format(env, p, action)
 
 	data := map[string]interface{}{
-		"eventType":     env.EventType,
-		"correlationId": env.CorrelationID,
-		"symbol":        firstNonEmpty(env.Symbol, p.Currency),
-		"direction":     env.Direction,
-		"side":          strings.ToUpper(env.Direction),
-		"action":        action,
-		"eventTime":     env.EventTime,
-		"strategyCode":  p.StrategyCode,
-		"period":        p.Period,
-		"currency":      p.Currency,
-		"isSale":        p.IsSale,
-		"isClose":       p.IsClose,
-		"isGain":        p.IsGain,
-		"gainTarget":    p.GainTarget,
-		"price":         p.Price,
-		"lossPrice":     p.LossPrice,
-		"gainPrices":    p.GainPrices,
-		"leverage":      p.Leverage,
-		"formatted":     text,
+		"eventType":       env.EventType,
+		"correlationId":   env.CorrelationID,
+		"symbol":          firstNonEmpty(env.Symbol, p.Currency),
+		"direction":       env.Direction,
+		"side":            strings.ToUpper(env.Direction),
+		"action":          action,
+		"eventTime":       env.EventTime,
+		"strategyCode":    p.StrategyCode,
+		"period":          p.Period,
+		"currency":        p.Currency,
+		"isSale":          p.IsSale,
+		"isClose":         p.IsClose,
+		"isGain":          p.IsGain,
+		"gainTarget":      p.GainTarget,
+		"price":           p.Price,
+		"lossPrice":       p.LossPrice,
+		"gainPrices":      p.GainPrices,
+		"leverage":        p.Leverage,
+		"formatted":       text,
+		"stopLossPrice":   p.LossPrice,
+		"takeProfitPrice": takeProfitPrice(p),
+		"totalAvgPx":      "",
 	}
 	if p.TotalGainTarget != 0 {
 		data["totalGainTarget"] = p.TotalGainTarget
 	}
-	if oid := parseOrderID(p.Remark); oid != "" {
-		data["orderId"] = oid
+	if r := parseRemark(p.Remark); r.OrderID != "" || r.Revenue != "" {
+		if r.OrderID != "" {
+			data["orderId"] = r.OrderID
+		}
+		if r.Revenue != "" {
+			data["revenue"] = r.Revenue
+		}
 	}
 	return event, data, nil
 }
@@ -128,16 +137,26 @@ func inferAction(p payload) string {
 	}
 }
 
-func parseOrderID(raw string) string {
+func takeProfitPrice(p payload) interface{} {
+	if gp := strings.TrimSpace(p.GainPrices); gp != "" {
+		return gp
+	}
+	if p.IsGain && p.Price > 0 {
+		return p.Price
+	}
+	return ""
+}
+
+func parseRemark(raw string) remark {
 	raw = strings.TrimSpace(raw)
 	if raw == "" {
-		return ""
+		return remark{}
 	}
 	var r remark
 	if err := json.Unmarshal([]byte(raw), &r); err != nil {
-		return ""
+		return remark{}
 	}
-	return r.OrderID
+	return r
 }
 
 func format(env envelope, p payload, action string) string {