fix: 补充遗漏

src/main/java/com/qqflow/engine/domain/flow/dto/NextNodeDTO.java

@@ -0,0 +1,18 @@
+package com.qqflow.engine.domain.flow.dto;
+
+import io.swagger.v3.oas.annotations.media.Schema;
+import lombok.Data;
+
+@Data
+@Schema(description = "下游节点DTO（分支选择用）")
+public class NextNodeDTO {
+
+    @Schema(description = "节点ID")
+    private String nodeId;
+
+    @Schema(description = "节点名称")
+    private String nodeName;
+
+    @Schema(description = "节点类型")
+    private String nodeType;
+}