chore: sync main (v9.6.5) into beta

[github-actions]

Automated sync of main back into beta after release v9.6.5, including beta version set to 9.6.6-beta.1.

Summary by Sourcery

Bump Unity MCP package, server, and extension versions to align beta branch with main after the 9.6.5 release.

Build:

• Update MCPForUnity package.json to version 9.6.6-beta.1 for the Unity package.
• Update Server project and browser extension manifest versions to 9.6.5 for the released server and extension artifacts.

Documentation:

• Refresh Server README example to reference the v9.6.5 server tag in installation instructions.

Chores:

• Sync beta branch metadata with main following the v9.6.5 release.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Syncs beta with main after release v9.6.5 by bumping package, server, and extension manifest versions and updating README install reference to the new release tag.

File-Level Changes

Change	Details	Files
Bump Unity package beta version to 9.6.6-beta.1 for the MCPForUnity package.	Update the npm-style Unity package version field from 9.6.5-beta.5 to 9.6.6-beta.1	MCPForUnity/package.json
Align server package and documentation with main release v9.6.5.	Update server README uvx install command to reference the v9.6.5 git tag instead of v9.6.4 Bump Python server project version from 9.6.4 to 9.6.5 in pyproject.toml	Server/README.md Server/pyproject.toml
Update browser extension manifest to v9.6.5 to match latest main release.	Change extension manifest version from 9.6.4 to 9.6.5	manifest.json

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[sourcery-ai]

Hey - I've reviewed your changes and they look great!

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