feat(crypto策略): 支持 AI 信号止盈止损事件与多字段渲染

Motivation:
区分止盈与止损事件，并为 AI crypto signals 策略提供更丰富的推送内容渲染能力（杠杆、止盈档位、收益、持仓周期等）。

Changes:

* 开仓（多/空，含原 isSale 空单）统一映射为 trade.open，不再发 trade.sell
* 新增 trade.gain 事件用于止盈，止损仍映射为 trade.close；HLSS 策略保持原有事件映射
* 新增 leverageText、tp1~tp5、closeAction、revenueDisplay、holdPeriod 等渲染字段
* 新增收益符号、止盈档位、持仓周期等格式化逻辑
* 补充 AI crypto signals 的模板与规则文档及单元测试

internal/subscriber/cryptostrategy/convert.go

@@ -38,6 +38,7 @@ type payload struct {
 type remark struct {
 	OrderID string `json:"orderId"`
 	Revenue string `json:"revenue"`
+	Period  string `json:"period"`
 }
 
 type Converter struct{}
@@ -99,12 +100,28 @@ func Convert(body []byte) (string, map[string]interface{}, error) {
 	if p.TotalGainTarget != 0 {
 		data["totalGainTarget"] = p.TotalGainTarget
 	}
-	if r := parseRemark(p.Remark); r.OrderID != "" || r.Revenue != "" {
+	if p.Leverage > 0 {
+		data["leverageText"] = fmt.Sprintf("%dx", p.Leverage)
+	}
+	for i, price := range splitPrices(p.GainPrices) {
+		if i >= 5 {
+			break
+		}
+		data[fmt.Sprintf("tp%d", i+1)] = compactPrice(price)
+	}
+	if p.IsGain {
+		data["closeAction"] = formatTPAction(p.GainTarget)
+	}
+	if r := parseRemark(p.Remark); r.OrderID != "" || r.Revenue != "" || r.Period != "" {
 		if r.OrderID != "" {
 			data["orderId"] = r.OrderID
 		}
 		if r.Revenue != "" {
 			data["revenue"] = r.Revenue
+			data["revenueDisplay"] = formatRevenue(r.Revenue, p.IsGain)
+		}
+		if hp := formatHoldPeriod(r.Period); hp != "" {
+			data["holdPeriod"] = hp
 		}
 	}
 	return event, data, nil
@@ -153,13 +170,23 @@ func mergePayloadFields(data map[string]interface{}, payloadJSON []byte) {
 }
 
 func inferAction(p payload) string {
+	if strings.EqualFold(strings.TrimSpace(p.StrategyCode), "HLSS") {
+		switch {
+		case p.IsClose:
+			return "CLOSE"
+		case p.IsGain:
+			return "GAIN"
+		case p.IsSale:
+			return "SELL"
+		default:
+			return "OPEN"
+		}
+	}
 	switch {
-	case p.IsClose:
-		return "CLOSE"
 	case p.IsGain:
 		return "GAIN"
-	case p.IsSale:
-		return "SELL"
+	case p.IsClose:
+		return "CLOSE"
 	default:
 		return "OPEN"
 	}
@@ -320,3 +347,67 @@ func firstNonEmpty(a, b string) string {
 	}
 	return b
 }
+
+func formatTPAction(gainTarget float64) string {
+	n := int(gainTarget)
+	names := []string{"", "第一", "第二", "第三", "第四", "第五"}
+	if n >= 1 && n < len(names) {
+		return fmt.Sprintf("到达%s止盈 (TP%d)", names[n], n)
+	}
+	return "到达止盈"
+}
+
+func formatRevenue(raw string, isGain bool) string {
+	s := strings.ReplaceAll(strings.TrimSpace(raw), "%", "")
+	s = strings.TrimSpace(s)
+	if s == "" {
+		return ""
+	}
+	switch {
+	case strings.HasPrefix(s, "+"), strings.HasPrefix(s, "-"):
+		return s + "%"
+	case isGain:
+		return "+" + s + "%"
+	default:
+		return "-" + s + "%"
+	}
+}
+
+func formatHoldPeriod(raw string) string {
+	s := strings.TrimSpace(raw)
+	if s == "" || strings.EqualFold(s, "signal") {
+		return ""
+	}
+	if strings.Contains(s, "小时") || strings.Contains(s, "分钟") {
+		return s
+	}
+	lower := strings.ToLower(s)
+	if n, ok := parseTrailingNumber(strings.TrimSpace(strings.TrimSuffix(lower, "min"))); ok {
+		return formatMinutes(n)
+	}
+	return s
+}
+
+func parseTrailingNumber(s string) (int, bool) {
+	s = strings.TrimSpace(s)
+	n, err := strconv.Atoi(s)
+	if err != nil {
+		return 0, false
+	}
+	return n, true
+}
+
+func formatMinutes(n int) string {
+	if n <= 0 {
+		return ""
+	}
+	h, m := n/60, n%60
+	switch {
+	case h > 0 && m > 0:
+		return fmt.Sprintf("%d小时%d分钟", h, m)
+	case h > 0:
+		return fmt.Sprintf("%d小时", h)
+	default:
+		return fmt.Sprintf("%d分钟", n)
+	}
+}