- Replace direct lark.EventDispatcherHandler.builder usage with dispatch_single_event helper
- Update lambda syntax from callback pattern to direct method reference
- Change department_created_v3 YAML to use array types instead of JSON strings
- Remove redundant imports and boilerplate code across all event handlers
- Improve consistency across IM, contact, calendar, approval, and drive events
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Co-Authored-By: Claude <noreply@anthropic.com>