feat: implement CSV-based organization chart import and enhance group hierarchy

adminfront/src/lib/adminApi.ts

@@ -260,6 +260,21 @@ export async function removeGroupMember(
   );
 }
 
+export async function importOrgChart(tenantId: string, file: File) {
+  const formData = new FormData();
+  formData.append("file", file);
+  const { data } = await apiClient.post(
+    `/v1/admin/tenants/${tenantId}/organization/import`,
+    formData,
+    {
+      headers: {
+        "Content-Type": "multipart/form-data",
+      },
+    },
+  );
+  return data;
+}
+
 export type GroupRole = {
   tenantId: string;
   tenantName: string;