Cloud Connect API endpoints

Added new Cloud Connect API endpoints to support Terraform-based AWS onboarding and permission checks.

New endpoints:

• GET /core/v1/cloudconnect/supportedFeatures/{accountID}: Returns feature-level permission readiness for a connected account as: supportedFeatures[] with name and hasRequiredPermissions.
• POST /core/v1/cloudconnect/aws/accounts: Create or update an AWS account role.
• GET /core/v1/cloudconnect/aws/accounts/{accountID}: Get current account state.
• PUT /core/v1/cloudconnect/aws/accounts/{accountID}: Update AWS feature settings.
• DELETE /core/v1/cloudconnect/aws/accounts/{accountID}: Delete account role.

Response model additions:

• AwsAccountResponse (account info, role ARN, optional S3 config, supported features, linked time).
• SupportedFeaturesResponse / SupportedFeature for feature-permission status.