feat: 重构标准 Skill 管理与发布链路

- 统一标准 ZIP 导入导出与通用资源模型

- 收口分类范围权限和创建人查询

- 完善发布快照、审批幂等与数据库清理迁移

easyflow-modules/easyflow-module-approval/src/main/java/tech/easyflow/approval/service/ApprovalInstanceService.java

@@ -61,4 +61,14 @@ public interface ApprovalInstanceService {
      * @return 审批实例
      */
     ApprovalInstance getById(BigInteger instanceId);
+
+    /**
+     * 判断给定实例是否仍是资源最近创建的审批实例。
+     *
+     * @param instanceId 审批实例 ID
+     * @param resourceType 资源类型
+     * @param resourceId 资源 ID
+     * @return 没有更新实例时返回 {@code true}
+     */
+    boolean isLatestResourceInstance(BigInteger instanceId, String resourceType, BigInteger resourceId);
 }

easyflow-modules/easyflow-module-approval/src/main/java/tech/easyflow/approval/service/impl/ApprovalInstanceServiceImpl.java

@@ -274,6 +274,20 @@ public class ApprovalInstanceServiceImpl implements ApprovalInstanceService {
                 .eq(ApprovalInstance::getTenantId, requireCurrentTenantId()));
     }
 
+    /**
+     * {@inheritDoc}
+     */
+    @Override
+    public boolean isLatestResourceInstance(BigInteger instanceId,
+                                            String resourceType,
+                                            BigInteger resourceId) {
+        return approvalInstanceMapper.selectCountByQuery(QueryWrapper.create()
+                .eq(ApprovalInstance::getTenantId, requireCurrentTenantId())
+                .eq(ApprovalInstance::getResourceType, resourceType)
+                .eq(ApprovalInstance::getResourceId, resourceId)
+                .gt(ApprovalInstance::getId, instanceId)) == 0;
+    }
+
     private Map<String, Object> buildInstanceSnapshot(ApprovalSubmitRequest request, ApprovalFlowDetailVo flow,
                                                       List<ApprovalFlowStepVo> steps, SysDept applicantDept) {
         Map<String, Object> snapshot = new LinkedHashMap<>();