KI-AGENT: Ergänze Mandantenexport und Import

frontend/pages/administration/tenants/index.vue

@@ -8,7 +8,9 @@ const admin = useAdmin()
 
 const loading = ref(true)
 const creatingTenant = ref(false)
+const importingTenant = ref(false)
 const createTenantModalOpen = ref(false)
+const importFileInput = ref<HTMLInputElement | null>(null)
 const tenants = ref<AdminTenant[]>([])
 const searchString = ref("")
 
@@ -89,6 +91,46 @@ const createTenant = async () => {
   }
 }
 
+const openImportFileDialog = () => {
+  importFileInput.value?.click()
+}
+
+const importTenantExport = async (event: Event) => {
+  const input = event.target as HTMLInputElement
+  const file = input.files?.[0]
+  if (!file || importingTenant.value) return
+
+  importingTenant.value = true
+
+  try {
+    const exportData = JSON.parse(await file.text())
+    const result = await admin.importTenant(exportData)
+    const rowCount = (result.tables || []).reduce((sum, table) => sum + table.rows, 0)
+
+    await fetchTenants()
+
+    toast.add({
+      title: "Mandantenimport abgeschlossen",
+      description: `Tenant ${result.tenantId}: ${rowCount} Datensätze und ${result.files?.restored || 0} Dateien verarbeitet.`,
+      color: "green",
+    })
+
+    if (result.tenantId) {
+      await router.push(`/administration/tenants/${result.tenantId}`)
+    }
+  } catch (err: any) {
+    console.error("[administration/tenants/import]", err)
+    toast.add({
+      title: "Mandant konnte nicht importiert werden",
+      description: err?.data?.error || err?.message || "Unbekannter Fehler",
+      color: "red",
+    })
+  } finally {
+    importingTenant.value = false
+    input.value = ""
+  }
+}
+
 onMounted(async () => {
   if (!auth.user?.is_admin) {
     await router.push("/")
@@ -111,6 +153,22 @@ onMounted(async () => {
       <UButton icon="i-heroicons-plus" @click="createTenantModalOpen = true">
         Tenant
       </UButton>
+      <input
+        ref="importFileInput"
+        type="file"
+        accept="application/json,.json"
+        class="hidden"
+        @change="importTenantExport"
+      >
+      <UButton
+        icon="i-heroicons-arrow-up-tray"
+        color="warning"
+        variant="soft"
+        :loading="importingTenant"
+        @click="openImportFileDialog"
+      >
+        Import
+      </UButton>
     </template>
   </UDashboardNavbar>