feat: 企微应用租户下拉选择 + corp_id 自动填入

- 租户表增加 corp_id 字段（企业微信企业ID）
- 租户管理页面支持配置 corp_id
- 企微应用页面租户从下拉选择
- 选择租户后自动填入 corp_id 并禁用编辑
- 提示用户如租户未配置 corp_id 需先去配置

frontend/src/views/tenants/index.vue

@@ -26,6 +26,7 @@ const formRef = ref(null)
 const form = reactive({
   code: '',
   name: '',
+  corp_id: '',
   status: 'active',
   expired_at: null,
   contact_info: {
@@ -69,6 +70,7 @@ function handleCreate() {
   Object.assign(form, {
     code: '',
     name: '',
+    corp_id: '',
     status: 'active',
     expired_at: null,
     contact_info: { contact: '', phone: '', email: '' }
@@ -82,6 +84,7 @@ function handleEdit(row) {
   Object.assign(form, {
     code: row.code,
     name: row.name,
+    corp_id: row.corp_id || '',
     status: row.status,
     expired_at: row.expired_at,
     contact_info: row.contact_info || { contact: '', phone: '', email: '' }
@@ -172,6 +175,7 @@ onMounted(() => {
       <el-table-column prop="id" label="ID" width="80" />
       <el-table-column prop="code" label="代码" width="120" />
       <el-table-column prop="name" label="名称" min-width="150" />
+      <el-table-column prop="corp_id" label="企业ID" width="200" show-overflow-tooltip />
       <el-table-column prop="status" label="状态" width="100">
         <template #default="{ row }">
           <el-tag :type="getStatusType(row.status)" size="small">
@@ -210,6 +214,9 @@ onMounted(() => {
         <el-form-item label="租户名称" prop="name">
           <el-input v-model="form.name" placeholder="公司/组织名称" />
         </el-form-item>
+        <el-form-item label="企业ID">
+          <el-input v-model="form.corp_id" placeholder="企业微信企业ID，ww开头" />
+        </el-form-item>
         <el-form-item label="状态">
           <el-select v-model="form.status" style="width: 100%">
             <el-option label="活跃" value="active" />