添加Swagger/OpenAPI依赖并更新用户账户管理相关的API文档注释，优化用户和管理员账户控制器的接口描述，移除不必要的字段和参数，调整数据库映射以简化用户账户管理逻辑。

target/classes/mapper/admin/AnnouncementMapper.xml

@@ -0,0 +1,67 @@
+<?xml version="1.0" encoding="UTF-8" ?>
+<!DOCTYPE mapper PUBLIC "-//mybatis.org//DTD Mapper 3.0//EN" "http://mybatis.org/dtd/mybatis-3-mapper.dtd">
+<mapper namespace="com.gameplatform.server.mapper.admin.AnnouncementMapper">
+    <resultMap id="AnnouncementMap" type="com.gameplatform.server.model.entity.admin.Announcement">
+        <id property="id" column="id" />
+        <result property="title" column="title" />
+        <result property="content" column="content" />
+        <result property="enabled" column="enabled" />
+        <result property="jumpUrl" column="jump_url" />
+        <result property="createdAt" column="created_at" />
+        <result property="updatedAt" column="updated_at" />
+    </resultMap>
+
+    <select id="findById" parameterType="long" resultMap="AnnouncementMap">
+        SELECT id, title, content, enabled, jump_url, created_at, updated_at
+        FROM announcement
+        WHERE id = #{id}
+        LIMIT 1
+    </select>
+
+    <insert id="insert" parameterType="com.gameplatform.server.model.entity.admin.Announcement" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO announcement (title, content, enabled, jump_url)
+        VALUES (#{title}, #{content}, #{enabled}, #{jumpUrl})
+    </insert>
+
+    <update id="update" parameterType="com.gameplatform.server.model.entity.admin.Announcement">
+        UPDATE announcement
+        <set>
+            <if test="title != null">title = #{title},</if>
+            <if test="content != null">content = #{content},</if>
+            <if test="enabled != null">enabled = #{enabled},</if>
+            <if test="jumpUrl != null">jump_url = #{jumpUrl},</if>
+        </set>
+        WHERE id = #{id}
+    </update>
+
+    <delete id="deleteById" parameterType="long">
+        DELETE FROM announcement WHERE id = #{id}
+    </delete>
+
+    <select id="findAll" resultMap="AnnouncementMap">
+        SELECT id, title, content, enabled, jump_url, created_at, updated_at
+        FROM announcement
+        ORDER BY created_at DESC
+        LIMIT #{size} OFFSET #{offset}
+    </select>
+
+    <select id="countAll" resultType="long">
+        SELECT COUNT(1) FROM announcement
+    </select>
+
+    <select id="findByEnabled" resultMap="AnnouncementMap">
+        SELECT id, title, content, enabled, jump_url, created_at, updated_at
+        FROM announcement
+        WHERE enabled = #{enabled}
+        ORDER BY created_at DESC
+        LIMIT #{size} OFFSET #{offset}
+    </select>
+
+    <select id="countByEnabled" resultType="long">
+        SELECT COUNT(1) FROM announcement WHERE enabled = #{enabled}
+    </select>
+
+    <update id="updateEnabled">
+        UPDATE announcement SET enabled = #{enabled} WHERE id = #{id}
+    </update>
+</mapper>