Channel for broadcasting global group list events.

Topic: "groups"

Clients may join this topic to receive real-time notifications when groups are created, updated, or deleted. Hidden groups are excluded from broadcasts.

Events pushed to clients

• "group_created" - A new group was created. Payload: group object
• "group_updated" - A group was updated. Payload: group object
• "group_deleted" - A group was deleted. Payload: %{id: integer}