refactor(environment): rename urls payload to data

- replace hardcoded URL keys with a generic key-value data map

- align backend DTOs, MCP schemas, and service import/export mapping

- update environment UI forms to edit JSON data instead of fixed fields

client/src/pages/environment/EnvironmentsPage.tsx

@@ -20,7 +20,7 @@ import styles from '../Page.module.css';
 function EnvironmentCard({ env, onDelete }: { env: Environment; onDelete: (id: string) => void }) {
   const { t } = useTranslation();
   const navigate = useNavigate();
-  const urlEntries = Object.entries(env.urls).filter(([, v]) => v);
+  const dataEntries = Object.entries(env.data).filter(([, v]) => v);
 
   const handleExport = async () => {
     const data = await environments.exportEnvironment(env.id);
@@ -87,15 +87,15 @@ function EnvironmentCard({ env, onDelete }: { env: Environment; onDelete: (id: s
       footer={footer}
       onClick={() => navigate(`/environments/${env.id}`)}
     >
-      {urlEntries.length > 0 && (
+      {dataEntries.length > 0 && (
         <DescriptionList
           layout="compact"
           truncate
-          items={urlEntries.map(([key, value]) => ({ term: key, detail: value }))}
+          items={dataEntries.map(([key, value]) => ({ term: key, detail: value }))}
         />
       )}
-      {urlEntries.length === 0 && (
-        <p className={styles.envCardEmpty}>{t('environments.no_urls')}</p>
+      {dataEntries.length === 0 && (
+        <p className={styles.envCardEmpty}>{t('environments.no_data')}</p>
       )}
     </Card>
   );