feat(system): 新增公告类型字段

为公告模块增加 category 字段，支持按类型筛选与展示，满足多场景公告分类需求。

yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/notice/vo/NoticePageReqVO.java

@@ -16,4 +16,6 @@ public class NoticePageReqVO extends PageParam {
     @Schema(description = "展示状态，参见 CommonStatusEnum 枚举类", example = "1")
     private Integer status;
 
+    @Schema(description = "公告类型")
+    private String category;
 }

yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/notice/vo/NoticeRespVO.java

@@ -27,4 +27,6 @@ public class NoticeRespVO {
     @Schema(description = "创建时间", requiredMode = Schema.RequiredMode.REQUIRED, example = "时间戳格式")
     private LocalDateTime createTime;
 
+    @Schema(description = "公告类型")
+    private String category;
 }

yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/controller/admin/notice/vo/NoticeSaveReqVO.java

@@ -29,4 +29,6 @@ public class NoticeSaveReqVO {
     @Schema(description = "状态，参见 CommonStatusEnum 枚举类", requiredMode = Schema.RequiredMode.REQUIRED, example = "1")
     private Integer status;
 
+    @Schema(description = "公告类型")
+    private String category;
 }

yudao-module-system/src/main/java/cn/iocoder/yudao/module/system/dal/dataobject/notice/NoticeDO.java

@@ -44,4 +44,5 @@ public class NoticeDO extends BaseDO {
      */
     private Integer status;
 
+    private String category;
 }