添加公告表及相关处理逻辑，支持公告列表查询

scripts/sql/init.sql

@@ -84,6 +84,36 @@ comment on column admin_role.created_at is '创建时间';
 comment on column admin_role.updated_at is '更新时间';
 comment on column admin_role.deleted_at is '删除时间';
 
+-- announcement
+drop table if exists announcement cascade;
+create table announcement (
+    id         serial primary key,
+    title      varchar(255) not null,
+    content    text,
+    type       int          not null default 1,
+    pin        bool         not null default false,
+    status     int          not null default 1,
+    sort       int          not null default 0,
+    created_at timestamp             default current_timestamp,
+    updated_at timestamp             default current_timestamp,
+    deleted_at timestamp
+);
+create index announcement_status_index on announcement (status);
+create index announcement_deleted_at_index on announcement (deleted_at);
+
+-- announcement表字段注释
+comment on table announcement is '公告表';
+comment on column announcement.id is '公告ID';
+comment on column announcement.title is '公告标题';
+comment on column announcement.content is '公告内容';
+comment on column announcement.type is '公告类型：1-普通公告';
+comment on column announcement.status is '公告状态：0-禁用，1-正常';
+comment on column announcement.pin is '是否置顶';
+comment on column announcement.sort is '公告排序';
+comment on column announcement.created_at is '创建时间';
+comment on column announcement.updated_at is '更新时间';
+comment on column announcement.deleted_at is '删除时间';
+
 -- endregion
 
 -- ====================