Issue #3575190: Add configurable queue items per cron for AI Automators
- Remove cron time budget from AutomatorFieldData QueueWorker so Drupal's built-in queue processor no longer runs it (1-second limit = effectively 1 item per cron, which is unusable for AI API calls).
- Add ai_automators.settings config (default: 10 items per cron run; 0 = unlimited) with schema and config/install defaults.
- Add AiAutomatorsSettingsForm at /admin/config/ai/ai-automators/settings so admins can tune throughput to stay within API rate limits.
- Implement hook_cron() via AiAutomatorsHooks OOP hook class, which claims and processes up to the configured number of queue items per cron run, logging and releasing any failed items for retry.
Closes #3575190