Align MiniExcel.Rust NuGet version with Rust 0.5.0 and fix README install docs

[shps951023]

Aligns the .NET wrapper version with the Rust crate line: the next NuGet release is 0.5.0-preview.1 (embedding MiniExcel for Rust 0.5.0 natives) instead of 0.1.0-preview.2.

• MiniExcel.Rust.csproj: version 0.5.0-preview.1 and updated release notes.
• nuget-release.yml: workflow_dispatch default and example now 0.5.0-preview.1.
• All six README variants and the benchmark docs: install command changed to --prerelease, NuGet page link added, NuGet version badge (nuget/vpre) added, benchmark references updated to 0.5.0-preview.1.

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ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Advanced

Run ID: 4116b5c7-5988-4fee-ac57-7ba47a754bef

📥 Commits

Reviewing files that changed from the base of the PR and between fa386bb and cf519e8.

📒 Files selected for processing (11)

• README.es.md
• README.fr.md
• README.ja.md
• README.md
• README.zh-CN.md
• README.zh-TW.md
• docs/i18n/README.es.md
• docs/i18n/README.fr.md
• docs/i18n/README.ja.md
• docs/i18n/README.zh-CN.md
• docs/i18n/README.zh-TW.md

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📝 Walkthrough

Walkthrough

The main and localized README files now include NuGet badges. Their .NET installation instructions use --prerelease instead of a pinned preview version and link to NuGet package versions.

Changes

NuGet documentation updates

Layer / File(s)	Summary
NuGet package badges README*.md, docs/i18n/README*.md	The README files add badges that link to the MiniExcel.Rust NuGet package.
Prerelease installation guidance README*.md, docs/i18n/README*.md	The .NET installation commands use --prerelease instead of --version 0.1.0-preview.2. The instructions add NuGet package links where described.

Priority: ⬇️ Low

Estimated code review effort: 1 (Trivial) | ~5 minutes

Change: Other

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately mentions the README installation documentation update, which is part of the changes. However, the changes also add NuGet badges and do not explicitly align a NuGet version with Ru…

✨ Finishing Touches

🧪 Generate unit tests (beta)

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