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/utils/oss.js

@@ -0,0 +1,72 @@
+// OSS 直传工具 - 配合后端 /common/oss/sign
+// 流程: 1) GET /common/oss/sign?dir=xxx 拿签名
+//       2) POST 到 OSS bucket, formData 携带 policy/signature/key/accessKeyId
+//       3) 拿回 OSS URL 写回表单
+import request from '@/utils/request'
+
+/**
+ * 获取 OSS 上传签名
+ * @param {string} dir 上传目录 (如 'ry8080/invitation/')
+ * @returns {Promise<{host, dir, accessKeyId, policy, signature, expire}>}
+ */
+export async function getOssSign(dir) {
+  const res = await request({
+    url: '/common/oss/sign',
+    method: 'get',
+    params: { dir }
+  })
+  if (res.code !== 200) {
+    throw new Error(res.msg || 'OSS 签名失败')
+  }
+  return res
+}
+
+/**
+ * 直接上传 File 到 OSS bucket
+ * @param {File} file 要上传的文件
+ * @param {string} dir 上传目录
+ * @returns {Promise<string>} 完整 URL (https://bucket.xxx/key)
+ */
+// 根据文件扩展名返回正确的 MIME,避免 OSS 默认给 application/octet-stream
+function getMimeByExt(name) {
+  const ext = (name || '').split('.').pop().toLowerCase()
+  const map = {
+    pdf:  'application/pdf',
+    doc:  'application/msword',
+    docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
+    png:  'image/png',
+    jpg:  'image/jpeg',
+    jpeg: 'image/jpeg',
+    gif:  'image/gif',
+    webp: 'image/webp'
+  }
+  return map[ext] || 'application/octet-stream'
+}
+
+export async function uploadToOss(file, dir) {
+  const sign = await getOssSign(dir)
+  const ext = (file.name || '').split('.').pop() || 'bin'
+  const key = sign.dir + Date.now() + '_' + Math.random().toString(36).slice(2, 8) + '.' + ext
+  // 显式传 Content-Type,让 OSS 按此存文件元数据, 浏览器拿到 application/pdf 即可内嵌预览
+  const mime = getMimeByExt(file.name)
+
+  const fd = new FormData()
+  fd.append('key', key)
+  fd.append('policy', sign.policy)
+  fd.append('OSSAccessKeyId', sign.accessKeyId)
+  fd.append('signature', sign.signature)
+  fd.append('success_action_status', '200')
+  fd.append('Content-Type', mime)
+  fd.append('file', file)
+
+  // ⚠️ 不要手动设置 Content-Type header,会让 multipart/form-data boundary 丢失
+  // FormData 会自动生成正确的 multipart 格式
+  const resp = await fetch(sign.host, {
+    method: 'POST',
+    body: fd
+  })
+  if (!resp.ok) {
+    throw new Error('OSS 上传失败: HTTP ' + resp.status)
+  }
+  return sign.host + '/' + key
+}