fix: use beta assemblies for prerelease documentation branches

[ifBars]

Beta prerelease pushes such as releases/3.2.1-beta.8 currently select main game assemblies and fail with missing beta-only types. This recognizes beta and anchored releases/X.Y.Z-beta.N names in the workflow ref and PR source/target refs, while stable releases continue selecting main. Explicit manual dispatch inputs retain precedence, including the existing default main; beta PR labels retain their fallback behavior.

Linked issue

Fixes #348. Confirmed the original failure in run 37166823910/job 111331912636: main assemblies selected, 38 compile errors.

Validation

• Executed the actual YAML-extracted Bash selector: 40/40 cases passed (18 push, 10 PR, 12 dispatch).
• Push: literal beta and versioned beta prereleases select beta; stable releases/main/stable/master and malformed or unrelated beta-like names select main.
• PR: beta source/target and beta prerelease source/target select beta; stable refs select main; beta label selects beta; non-dispatch inputs are ignored.
• Dispatch: explicit main/beta wins on beta and stable refs; omitted-input fallback uses branch detection. The UI default remains main.
• Workflow parsed with PyYAML 6.0.3 BaseLoader and duplicate-key rejection; bash -n passed.
• actionlint 1.7.12 with -shellcheck='' passed (ShellCheck unavailable); git diff --check passed.
• Local Mono/IL2CPP restore/build/tests could not run: this environment has no .NET SDK or private game assemblies. Hosted validation is recorded below.

Compatibility

Only .github/workflows/docs.yml changes. No public/protected API, runtime behavior, stable IDs, saves, or network payloads change. Cache keys, deployment conditions, and manual-input defaults are preserved.

Contributor checklist

• Linked an issue opened before this PR with the intended approach.
• Checked existing issues and PRs for overlapping work.
• Addresses one focused problem.

Hosted CI results

For commit b39b5dd250040c73df19e3f55fc454b98f822217:

• Documentation run 37210482825: success. The selector logged beta assemblies and restored the beta assembly cache. S1API Mono build, 775 Mono tests, DocFX, documentation coverage 82.26% (3,400/4,133; minimum 80%), and public API compatibility all passed. Deployment was skipped for this PR.
• IL2CPP Build Check run 37210482815: success. This workflow builds IL2CPP; it does not run IL2CPP tests.

The original failed release run was not rerun because rerunning would use its old workflow commit. This PR remains unmerged, and the shipped prerelease branch/tag is unchanged. Push and dispatch selection were validated locally against the actual updated step; hosted verification used the PR event.

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