feat: add support for ELK home automation

[mfreeman451]

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Create an agent that speaks the ELK protocol (https://github.com/scottlamb/elkm1 might be a good start). SR poller will hit the GRPC endpoints on the agent and send the data to the core.

• ELK agent (prefer in rust)
• Core update (add new registry handler)
• Convert ELK agent responses to OCSF schemas
• UI dashboard update

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