refactor: 合并 biz_support_unit/biz_execution_unit/biz_service_org 为 biz_org, 删除 2 张孤儿表, 改 biz_person.work_unit → org_id FK

主要改动:
- SQL: biz_support_unit → biz_org, 加 org_type, 加 business_nature; 删 biz_execution_unit, biz_service_org
- SQL: biz_project.support_unit_id/name + service_org_id/name → org_id/name/type
- SQL: biz_meeting.support_unit_name → org_name
- SQL: biz_person.work_unit → org_id (FK)
- 后端: 新 BizOrg entity/mapper/service/controller
- 后端: BizProject/BizMeeting 字段重命名
- 后端: 删 12 个 BizSupportUnit/BizExecutionUnit/BizServiceOrg Java 文件
- 后端: BizPersonImportVO.workUnit → orgName (导入时查 biz_org 取 org_id)
- 后端: BizAuthController.registerExecutor 完整实现 (原 registerSupplier stub)
- 前端: 新 admin/Orgs.vue + manager/Orgs.vue (原 SupportUnits)
- 前端: RegisterExecutor.vue (原 RegisterSupplier, 单页 2 步)
- 前端: sponsor/executor/manager 多个文件 workUnit → orgId/orgName 重命名
- 前端: 统一 supplier → executor, 业务命名 sponsor(赞助方) / executor(执行方=供应商)
- 前端: 全工程 execution → executor (company type / role / person unit_type)

ry-api/ruoyi-system/src/main/resources/mapper/system/SysNoticeReadMapper.xml

@@ -0,0 +1,88 @@
+<?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.ruoyi.system.mapper.SysNoticeReadMapper">
+
+    <resultMap type="SysNoticeRead" id="SysNoticeReadResult">
+        <id     property="readId"   column="read_id"     />
+        <result property="noticeId" column="notice_id"   />
+        <result property="userId"   column="user_id"     />
+        <result property="readTime" column="read_time"   />
+    </resultMap>
+
+    <!-- 新增已读记录 -->
+    <insert id="insertNoticeRead" parameterType="SysNoticeRead">
+        insert ignore into sys_notice_read (notice_id, user_id, read_time)
+        values (#{noticeId}, #{userId}, sysdate())
+    </insert>
+
+    <!-- 查询未读数量：正常状态公告 减去 当前用户已读数 -->
+    <select id="selectUnreadCount" resultType="int">
+        select count(*) from sys_notice n
+        where n.status = '0' and not exists (select 1 from sys_notice_read r where r.notice_id = n.notice_id and r.user_id = #{userId})
+    </select>
+
+    <!-- 查询是否已读 -->
+    <select id="selectIsRead" resultType="int">
+        select count(*) from sys_notice_read where notice_id = #{noticeId} and user_id = #{userId}
+    </select>
+
+    <!-- 查询带已读状态的公告列表（直接在SQL中限制条数） -->
+    <select id="selectNoticeListWithReadStatus" resultType="SysNotice">
+        select
+            n.notice_id    as noticeId,
+            n.notice_title as noticeTitle,
+            n.notice_type  as noticeType,
+            n.status,
+            n.create_by    as createBy,
+            n.create_time  as createTime,
+            case when r.notice_id is not null then true else false end as isRead
+        from sys_notice n
+        left join sys_notice_read r
+            on r.notice_id = n.notice_id and r.user_id = #{userId}
+        where n.status = '0'
+        order by n.notice_id desc
+        limit #{limit}
+    </select>
+
+    <!-- 批量标记已读 -->
+    <insert id="insertNoticeReadBatch">
+        insert ignore into sys_notice_read (notice_id, user_id, read_time)
+        values
+        <foreach collection="noticeIds" item="noticeId" separator=",">
+            (#{noticeId}, #{userId}, sysdate())
+        </foreach>
+    </insert>
+
+    <!-- 删除公告时清理已读记录 -->
+    <delete id="deleteByNoticeIds">
+        delete from sys_notice_read where notice_id in
+        <foreach collection="noticeIds" item="noticeId" open="(" separator="," close=")">
+            #{noticeId}
+        </foreach>
+    </delete>
+
+    <!-- 查询已阅读某公告的用户列表，支持按登录名/用户名模糊筛选 -->
+    <select id="selectReadUsersByNoticeId" resultType="java.util.Map">
+        select
+            u.user_id      as userId,
+            u.user_name    as userName,
+            u.nick_name    as nickName,
+            d.dept_name    as deptName,
+            u.phonenumber  as phonenumber,
+            r.read_time    as readTime
+        from sys_notice_read r
+        inner join sys_user u on u.user_id = r.user_id and u.del_flag = '0'
+        left join sys_dept d on d.dept_id = u.dept_id
+        where r.notice_id = #{noticeId}
+        <if test="searchValue != null and searchValue != ''">
+            and (
+                u.user_name like concat('%', #{searchValue}, '%')
+                or u.nick_name like concat('%', #{searchValue}, '%')
+            )
+        </if>
+        order by r.read_time desc
+    </select>
+
+</mapper>