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-business/src/main/resources/mapper/business/BizProjectSponsorAssignMapper.xml

@@ -0,0 +1,40 @@
+<?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.business.mapper.BizProjectSponsorAssignMapper">
+    <resultMap id="BaseResultMap" type="BizProjectSponsorAssign">
+        <id     property="id"             column="id" />
+        <result property="projectId"      column="project_id" />
+        <result property="sponsorUserId"  column="sponsor_user_id" />
+        <result property="monitorUserId"  column="monitor_user_id" />
+        <result property="assignDesc"     column="assign_desc" />
+        <result property="assignPoints"   column="assign_points" />
+        <result property="createBy"       column="create_by" />
+        <result property="createTime"     column="create_time" />
+        <result property="sponsorUserName" column="sponsor_user_name" />
+        <result property="monitorUserName" column="monitor_user_name" />
+    </resultMap>
+
+    <insert id="insertAssign" parameterType="BizProjectSponsorAssign" useGeneratedKeys="true" keyProperty="id">
+        INSERT INTO biz_project_sponsor_assign
+            (project_id, sponsor_user_id, monitor_user_id, assign_desc, assign_points, create_by, create_time)
+        VALUES
+            (#{projectId}, #{sponsorUserId}, #{monitorUserId}, #{assignDesc}, #{assignPoints}, #{createBy}, sysdate())
+    </insert>
+
+    <!-- 按 project_id 全删 (赞助方分配策略: 一个项目只分配一个 sponsor, 先删后插) -->
+    <delete id="deleteByProjectId" parameterType="String">
+        delete from biz_project_sponsor_assign where project_id = #{projectId}
+    </delete>
+
+    <select id="selectByProjectId" resultMap="BaseResultMap">
+        SELECT a.*,
+               s.user_name AS sponsor_user_name,
+               m.user_name AS monitor_user_name
+        FROM biz_project_sponsor_assign a
+        LEFT JOIN sys_user s ON a.sponsor_user_id = s.user_id
+        LEFT JOIN sys_user m ON a.monitor_user_id = m.user_id
+        WHERE a.project_id = #{projectId}
+        ORDER BY a.create_time DESC
+    </select>
+</mapper>