chore(release): prepare S1API 3.2.1-beta.7

[ifBars]

Prepares 3.2.1-beta.7 from beta after merging #328 and #329. Updates the project and Melon versions and adds release notes for external app hosting and the custom-contact fixes.

Both source PRs passed their required hosted checks. The combined candidate passed 740 Mono and 720 IL2CPP tests locally before the final coroutine hook relocation; that relocation then passed hosted checks on #329. This release PR checks the merged candidate. Additional live icon and two-peer checks remain incomplete; the release notes disclose that limit.

Compatibility

This PR changes version metadata and documentation only. It makes no further API, save, or network changes. The prerelease uses beta game assemblies and publishes to GitHub only.

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