feat(crypto策略): 新增 AG 趋势、异动与波段跟踪信号支持

Motivation:
crypto-strategy 源新增 AG 趋势(AGTS)、异动(AMA)、波段跟踪(BTS) 三类量化策略信号，需与既有 trade.* 事件区分以避免和 AI crypto signals 精确匹配冲突，并为缺省方向提供兜底推导。

Changes:

* 事件名映射按 strategyCode 使用独立前缀（AGTS./AMA./BTS.，HLSS 保持不变）
* direction/side 缺失时依据 isSale 兜底推导为 LONG/SHORT
* 补充三类策略的模板、规则示例文档与渲染/转换测试

internal/subscriber/cryptostrategy/convert.go

@@ -62,18 +62,23 @@ func Convert(body []byte) (string, map[string]interface{}, error) {
 	}
 
 	action := inferAction(p)
-	event := "trade." + strings.ToLower(action)
-	if strings.EqualFold(strings.TrimSpace(p.StrategyCode), "HLSS") {
-		event = "HLSS." + strings.ToLower(action)
-	}
+	event := eventName(p.StrategyCode, action)
 	text := format(env, p, action)
+	side := strings.ToUpper(strings.TrimSpace(env.Direction))
+	if side == "" {
+		if p.IsSale {
+			side = "SHORT"
+		} else {
+			side = "LONG"
+		}
+	}
 
 	data := map[string]interface{}{
 		"eventType":       env.EventType,
 		"correlationId":   env.CorrelationID,
 		"symbol":          firstNonEmpty(env.Symbol, p.Currency),
-		"direction":       env.Direction,
-		"side":            strings.ToUpper(env.Direction),
+		"direction":       firstNonEmpty(env.Direction, side),
+		"side":            side,
 		"action":          action,
 		"eventTime":       env.EventTime,
 		"strategyCode":    p.StrategyCode,
@@ -171,6 +176,17 @@ func mergePayloadFields(data map[string]interface{}, payloadJSON []byte) {
 	}
 }
 
+func eventName(strategyCode, action string) string {
+	code := strings.ToUpper(strings.TrimSpace(strategyCode))
+	suffix := strings.ToLower(action)
+	switch code {
+	case "HLSS", "AMA", "BTS", "AGTS":
+		return code + "." + suffix
+	default:
+		return "trade." + suffix
+	}
+}
+
 func inferAction(p payload) string {
 	if strings.EqualFold(strings.TrimSpace(p.StrategyCode), "HLSS") {
 		switch {