#5683: fix(cron): default enabled=true + gateway retry logic

## Changes ### 1. fix(cron): default enabled=true for new jobs New cron jobs should default to enabled unless explicitly set to false. ### 2. feat(gateway): add retry logic with exponential backoff for timeout errors - Increase default timeout from 10s to 30s for busy gateways - Add up to 2 retry attempts on timeout errors only - Implement exponential backoff (500ms, 1s) between retries - Non-timeout errors still fail immediately This helps with transient gateway timeouts during high load.