feat(login): 私有化部署时隐藏注册账号入口

通过 /api/private/deployment/status 判断部署模式，PRIVATE 模式下不渲染注册链接。

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tenant-platform/src/views/auth/LoginView.vue

@@ -25,7 +25,7 @@
       </el-form>
 
       <div class="links">
-        <router-link to="/register">注册账号</router-link>
+        <router-link v-if="!isPrivate" to="/register">注册账号</router-link>
         <router-link to="/forgot-password">忘记密码</router-link>
       </div>
     </el-card>
@@ -39,6 +39,7 @@ import { ElMessage } from 'element-plus'
 import type { FormInstance, FormRules } from 'element-plus'
 import { authApi } from '@/api/auth'
 import { useAuthStore } from '@/stores/auth'
+import { getDeploymentStatus } from '@/api/system'
 
 const router = useRouter()
 const auth = useAuthStore()
@@ -47,6 +48,7 @@ const formRef = ref<FormInstance>()
 const loading = ref(false)
 const captchaKey = ref('')
 const captchaImage = ref('')
+const isPrivate = ref(false)
 
 const form = reactive({ account: '', password: '', captchaCode: '' })
 const rules: FormRules = {
@@ -81,7 +83,13 @@ async function handleLogin() {
   }
 }
 
-onMounted(loadCaptcha)
+onMounted(async () => {
+  loadCaptcha()
+  try {
+    const status = await getDeploymentStatus()
+    isPrivate.value = status.mode === 'PRIVATE'
+  } catch {}
+})
 </script>
 
 <style scoped>