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/components/Preview.vue

@@ -0,0 +1,72 @@
+<template>
+  <el-dialog v-model="open" :title="title" width="780" top="6vh" :close-on-click-modal="false" destroy-on-close>
+    <div v-if="fileUrl" class="preview-box">
+      <!-- 图片 -->
+      <img v-if="kind === 'image'" :src="fileUrl" class="preview-img" :alt="title" />
+      <!-- PDF：iframe 预览，浏览器内置 viewer -->
+      <iframe v-else-if="kind === 'pdf'" :src="fileUrl" class="preview-iframe" />
+      <!-- 其它（doc/xls/zip 等）：给下载链接 -->
+      <div v-else class="preview-fallback">
+        <el-icon class="fallback-icon"><Document /></el-icon>
+        <p>该文件类型暂不支持页内预览,请点击下方按钮下载/在新窗口打开查看。</p>
+        <el-button type="primary" @click="openNew">在新窗口打开</el-button>
+        <el-button @click="copyUrl">复制链接</el-button>
+      </div>
+    </div>
+    <el-empty v-else description="暂无附件" />
+    <template #footer>
+      <el-button @click="open = false">关闭</el-button>
+      <el-button v-if="fileUrl" type="primary" @click="openNew">在新窗口打开</el-button>
+    </template>
+  </el-dialog>
+</template>
+
+<script setup>
+import { ref, computed, watch } from 'vue'
+import { Document } from '@element-plus/icons-vue'
+import { ElMessage } from 'element-plus'
+
+const props = defineProps({
+  modelValue: Boolean,
+  url: { type: String, default: '' },
+  title: { type: String, default: '附件预览' }
+})
+const emit = defineEmits(['update:modelValue'])
+
+const open = computed({
+  get: () => props.modelValue,
+  set: v => emit('update:modelValue', v)
+})
+
+const fileUrl = computed(() => props.url || '')
+
+const kind = computed(() => {
+  const u = fileUrl.value.split('?')[0].toLowerCase()
+  if (/\.(png|jpe?g|gif|webp|bmp|svg)(\?.*)?$/.test(u)) return 'image'
+  if (/\.pdf(\?.*)?$/.test(u)) return 'pdf'
+  return 'other'
+})
+
+function openNew() {
+  if (!fileUrl.value) return
+  window.open(fileUrl.value, '_blank', 'noopener')
+}
+async function copyUrl() {
+  if (!fileUrl.value) return
+  try {
+    await navigator.clipboard.writeText(fileUrl.value)
+    ElMessage.success('链接已复制')
+  } catch {
+    ElMessage.error('复制失败,请手动复制')
+  }
+}
+</script>
+
+<style scoped>
+.preview-box { display: flex; justify-content: center; align-items: flex-start; min-height: 480px; }
+.preview-img { max-width: 100%; max-height: 70vh; object-fit: contain; }
+.preview-iframe { width: 100%; height: 70vh; border: 1px solid #ebeef5; border-radius: 4px; }
+.preview-fallback { text-align: center; padding: 48px 24px; color: #606266; }
+.fallback-icon { font-size: 48px; color: #909399; margin-bottom: 12px; }
+.preview-fallback p { margin: 12px 0 24px; }
+</style>