Implement binary serialization for backchannel comms

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Much more lightweight backend communication

[hhvrc]

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Pull Request Overview

This PR implements binary serialization for backchannel communications to make backend communication more lightweight. The changes replace JSON-based Redis pub/sub messaging with MessagePack serialization and restructure the messaging system.

Key changes:

• Replace JSON serialization with MessagePack for Redis pub/sub messages
• Consolidate multiple Redis channels into device-specific channels with typed payloads
• Extract control logic into a dedicated service with improved error handling

Reviewed Changes

Copilot reviewed 38 out of 38 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
LiveControlGateway/PubSub/RedisSubscriberService.cs	Removed JSON-based Redis subscriber service entirely
Common/Redis/PubSub/*.cs	Replaced JSON message classes with MessagePack-based unified message types
Common/Services/RedisPubSub/RedisPubService.cs	Updated to use MessagePack serialization and new message structure
Common/Services/ControlSender.cs	New service extracting control logic with improved error handling
LiveControlGateway/LifetimeManager/HubLifetime.cs	Updated to consume MessagePack messages from device-specific channels
Common/Models/SharePermsAndLimits.cs	Consolidated permission models into single class

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