docs: add signalr websocket guide

[LucHeart]

Summary

• document using OpenShock's SignalR WebSockets
• link guide in developer docs and navigation
• add server and client method definitions

Testing

• mkdocs build

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https://chatgpt.com/codex/tasks/task_e_6896202ef0f88327b1c296ec74d574f9

[changeset-bot]

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Latest commit: 8f360cc

Merging this PR will not cause a version bump for any packages. If these changes should not result in a new version, you're good to go. If these changes should result in a version bump, you need to add a changeset.

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