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/SysRoleDeptMapper.xml

@@ -0,0 +1,34 @@
+<?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.SysRoleDeptMapper">
+
+	<resultMap type="SysRoleDept" id="SysRoleDeptResult">
+		<result property="roleId"     column="role_id"      />
+		<result property="deptId"     column="dept_id"      />
+	</resultMap>
+
+	<delete id="deleteRoleDeptByRoleId" parameterType="Long">
+		delete from sys_role_dept where role_id=#{roleId}
+	</delete>
+	
+	<select id="selectCountRoleDeptByDeptId" resultType="Integer">
+	    select count(1) from sys_role_dept where dept_id=#{deptId}
+	</select>
+	
+	<delete id="deleteRoleDept" parameterType="Long">
+ 		delete from sys_role_dept where role_id in
+ 		<foreach collection="array" item="roleId" open="(" separator="," close=")">
+ 			#{roleId}
+        </foreach> 
+ 	</delete>
+	
+	<insert id="batchRoleDept">
+		insert into sys_role_dept(role_id, dept_id) values
+		<foreach item="item" index="index" collection="list" separator=",">
+			(#{item.roleId},#{item.deptId})
+		</foreach>
+	</insert>
+	
+</mapper>