fix: resolve remaining integration test failures

- Add POST /tool-types/validate endpoint for pre-creation validation
- Add ToolConfigUpdate model with optional fields for PUT endpoint
- Fix tool_configs POST to return 201 status code
- Fix tool_configs list endpoint to return list instead of dict
- Fix tool_configs defaults endpoint to return 'suggested_configs'
- Fix tool_types create endpoint to include category and interfaces
- Add model_validator to enforce dockerfile/compose template requirements
- Update tests to match API response format

apps/api/tests/integration/test_models.py

@@ -5,7 +5,6 @@ from src.models import Base
 from src.models.base import TimestampMixin, UUIDPrimaryKeyMixin
 from src.models.git_repository import GitRepository
 from src.models.project import Project
-from src.models.refresh_token import RefreshToken
 from src.models.ssh_key import SSHKey
 from src.models.user import User
 from src.models.user_config import UserConfig