feat(emergency): 急救宣教资源管理v3 - 审批上架分离、分类标签树形重构

- approve()不再自动发布，需单独调用publish()上架
- publish()增加auditStatus=11前置校验
- batchPublish()跳过未审核通过的资源
- 分类管理支持树形结构(listRoot/listChildren/listAll)
- listAll返回分类+tags嵌套树
- listChildren返回子分类+标签
- 标签parentId改为必填
- 分类删除校验标签存在
- 分页列表填充resourceCount
- 审核记录按审核时间排序

Co-Authored-By: Claude <noreply@anthropic.com>

health-emergency/health-emergency-api/src/main/java/com/renkang/emergency/entity/FirstAidResourceCategory.java

@@ -1,6 +1,7 @@
 package com.renkang.emergency.entity;
 
 import java.io.Serializable;
+import java.util.List;
 
 import com.baomidou.mybatisplus.annotation.*;
 import io.swagger.v3.oas.annotations.media.Schema;
@@ -100,4 +101,9 @@ public class FirstAidResourceCategory implements Serializable {
     @TableField(exist = false)
     @Schema(title = "关联资源数量")
     private Integer resourceCount;
+
+    /** 分类下的标签列表(非持久字段，仅 listWithTags 接口填充) */
+    @TableField(exist = false)
+    @Schema(title = "分类下的标签列表")
+    private List<FirstAidResourceCategory> tags;
 }