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/i18n/locales/en.json

@@ -21,11 +21,11 @@
     "title": "Environments",
     "col_id": "ID",
     "col_name": "Name",
-    "col_urls": "URLs",
+    "col_data": "Data",
     "col_updated": "Updated",
     "empty": "No environments yet.",
     "loading": "Loading…",
-    "no_urls": "No URLs configured.",
+    "no_data": "No data configured.",
     "menu_label": "Environment options",
     "action_view": "View details",
     "action_delete": "Delete",
@@ -41,14 +41,13 @@
     "form_name": "Name",
     "form_name_placeholder": "e.g. staging, production",
     "form_name_required": "Name is required",
-    "form_id_url": "ID URL",
-    "form_cabinet_url": "Cabinet URL",
-    "form_admin_url": "Admin URL",
+    "form_data": "Data (JSON)",
+    "form_data_invalid_json": "Must be a valid JSON object",
     "back": "Environments",
     "field_id": "ID",
     "field_created": "Created",
     "field_updated": "Updated",
-    "section_urls": "URLs"
+    "section_data": "Data"
   },
   "credentials": {
     "title": "Credentials",