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/domain/OaArticle.java

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+package com.ruoyi.oa.domain;
+
+import com.baomidou.mybatisplus.annotation.*;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import java.io.Serializable;
+import java.util.Date;
+import java.math.BigDecimal;
+
+import com.ruoyi.common.core.domain.BaseEntity;
+
+/**
+ * 文章对象 oa_article
+ *
+ * @author Joshi
+ * @date 2025-09-02
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+@TableName("oa_article")
+public class OaArticle extends BaseEntity {
+
+    private static final long serialVersionUID=1L;
+
+    /**
+     * 文章主键ID
+     */
+    @TableId(value = "article_id")
+    private Long articleId;
+    /**
+     * 文章标题
+     */
+    private String title;
+    /**
+     * 文章内容
+     */
+    private String content;
+    /**
+     * 文章附件（存储附件路径等信息）
+     */
+    private String accessory;
+    /**
+     * 备注
+     */
+    private String remark;
+    /**
+     * 删除标志（0正常 1删除）
+     */
+    @TableLogic
+    private Long delFlag;
+
+}

ruoyi-oa/src/main/java/com/ruoyi/oa/domain/bo/OaArticleBo.java

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+package com.ruoyi.oa.domain.bo;
+
+import com.ruoyi.common.core.validate.AddGroup;
+import com.ruoyi.common.core.validate.EditGroup;
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+import javax.validation.constraints.*;
+
+import java.util.Date;
+
+import com.ruoyi.common.core.domain.BaseEntity;
+
+/**
+ * 文章业务对象 oa_article
+ *
+ * @author Joshi
+ * @date 2025-09-02
+ */
+
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class OaArticleBo extends BaseEntity {
+
+    /**
+     * 文章主键ID
+     */
+    private Long articleId;
+
+    /**
+     * 文章标题
+     */
+    private String title;
+
+    /**
+     * 文章内容
+     */
+    private String content;
+
+    /**
+     * 文章附件（存储附件路径等信息）
+     */
+    private String accessory;
+
+    /**
+     * 备注
+     */
+    private String remark;
+
+
+}

ruoyi-oa/src/main/java/com/ruoyi/oa/domain/vo/OaArticleVo.java

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+package com.ruoyi.oa.domain.vo;
+
+import com.alibaba.excel.annotation.ExcelIgnoreUnannotated;
+import com.alibaba.excel.annotation.ExcelProperty;
+import com.ruoyi.common.annotation.ExcelDictFormat;
+import com.ruoyi.common.convert.ExcelDictConvert;
+import lombok.Data;
+import java.util.Date;
+
+
+
+/**
+ * 文章视图对象 oa_article
+ *
+ * @author Joshi
+ * @date 2025-09-02
+ */
+@Data
+@ExcelIgnoreUnannotated
+public class OaArticleVo {
+
+    private static final long serialVersionUID = 1L;
+
+    /**
+     * 文章主键ID
+     */
+    @ExcelProperty(value = "文章主键ID")
+    private Long articleId;
+
+    /**
+     * 文章标题
+     */
+    @ExcelProperty(value = "文章标题")
+    private String title;
+
+    /**
+     * 文章内容
+     */
+    @ExcelProperty(value = "文章内容")
+    private String content;
+
+    /**
+     * 文章附件（存储附件路径等信息）
+     */
+    @ExcelProperty(value = "文章附件", converter = ExcelDictConvert.class)
+    @ExcelDictFormat(readConverterExp = "存=储附件路径等信息")
+    private String accessory;
+
+    /**
+     * 备注
+     */
+    @ExcelProperty(value = "备注")
+    private String remark;
+
+
+}