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-vue3/src/views/auth/RegisterSponsor.vue

@@ -0,0 +1,36 @@
+<template>
+  <div class="page-wrap">
+    <div class="page-card">
+      <div class="page-title">赞助方注册</div>
+      <el-steps :active="step" finish-status="success" simple class="steps">
+        <el-step title="账号信息" /><el-step title="单位信息" />
+      </el-steps>
+      <div class="step-body">
+        <template v-if="step === 0">
+          <el-form :model="form" label-width="100px"><el-form-item label="用户名"><el-input v-model="form.username" /></el-form-item><el-form-item label="密码"><el-input v-model="form.password" type="password" /></el-form-item></el-form>
+        </template>
+        <template v-else>
+          <el-form :model="form" label-width="100px"><el-form-item label="单位名称"><el-input v-model="form.unitName" /></el-form-item><el-form-item label="联系人"><el-input v-model="form.contact" /></el-form-item><el-form-item label="联系电话"><el-input v-model="form.phone" /></el-form-item><el-form-item label="赞助意向"><el-input v-model="form.intent" type="textarea" /></el-form-item></el-form>
+        </template>
+      </div>
+      <div style="text-align:center;margin-top:16px">
+        <el-button @click="prev" :disabled="step === 0">上一步</el-button>
+        <el-button type="primary" @click="next" v-if="step < 2">下一步</el-button>
+        <el-button @click="$router.push('/login')" v-else>去登录</el-button>
+      </div>
+    </div>
+  </div>
+</template>
+<script setup>
+import { reactive, ref } from 'vue'
+import { registerSponsor } from '@/api/public'
+import { ElMessage } from 'element-plus'
+const step = ref(0)
+const form = reactive({ username: '', password: '', unitName: '', contact: '', phone: '', intent: '' })
+const prev = () => step.value = Math.max(0, step.value - 1)
+const next = async () => {
+  if (step.value === 1) { try { await registerSponsor(form); ElMessage.success('已提交') } catch { /* demo */ } step.value = 2; return }
+  step.value++
+}
+</script>
+<style scoped>.steps { max-width: 560px; margin: 16px auto; } .step-body { max-width: 560px; margin: 16px auto; }</style>