feat(oa): 添加文章管理功能

- 新增文章管理相关的实体类、Mapper、Service、Controller- 实现文章的增删改查、分页查询、导出等功能
- 添加数据校验和逻辑删除支持

ruoyi-oa/src/main/java/com/ruoyi/oa/mapper/OaArticleMapper.java

@@ -0,0 +1,15 @@
+package com.ruoyi.oa.mapper;
+
+import com.ruoyi.oa.domain.OaArticle;
+import com.ruoyi.oa.domain.vo.OaArticleVo;
+import com.ruoyi.common.core.mapper.BaseMapperPlus;
+
+/**
+ * 文章Mapper接口
+ *
+ * @author Joshi
+ * @date 2025-09-02
+ */
+public interface OaArticleMapper extends BaseMapperPlus<OaArticleMapper, OaArticle, OaArticleVo> {
+
+}