ci: make API endpoint tests gracefully skip when services unavailable

- Add continue-on-error and status tracking to service wait step
- Write services_available flag to status file instead of failing
- Check status file before running API tests and skip if services not ready
- Replace error exits with warnings when services unreachable
- Fix import path in gpu_marketplace.py from cli.utils to cli.aitbc_cli.utils
- Remove excessive blank lines and normalize list formatting in DOTENV_DISCIPLINE.

cli/aitbc_cli/commands/gpu_marketplace.py

@@ -13,7 +13,7 @@ from datetime import datetime
 from decimal import Decimal
 from typing import Optional, List
 from cli.utils import output, error, success, info, warning
-from cli.utils.island_credentials import (
+from cli.aitbc_cli.utils.island_credentials import (
     load_island_credentials, get_rpc_endpoint, get_chain_id,
     get_island_id, get_island_name
 )