fix: 实验步骤增加时间

src/main/java/com/qyft/gd/model/entity/TaskSteps.java

@@ -6,6 +6,8 @@ import jakarta.validation.constraints.NotBlank;
 import lombok.Data;
 import lombok.EqualsAndHashCode;
 
+import java.time.LocalDateTime;
+
 @EqualsAndHashCode(callSuper = false)
 @Schema(description = "实验步骤")
 @TableName("task_steps")
@@ -23,4 +25,8 @@ public class TaskSteps {
     @NotBlank
     @Schema(description = "步骤描述")
     private String stepDescription;
+
+    @NotBlank
+    @Schema(description = "创建时间")
+    private LocalDateTime createTime;
 }