Add MiniExcel NuGet stress benchmark

[shps951023]

Summary

• add an isolated net8.0 benchmark runner that references public MiniExcel v1 and the locally packed MiniExcel.Rust NuGet
• resolve the latest stable MiniExcel v1 from NuGet by default, with an exact-version override for reproducibility
• validate every row, column, normalized value, and result hash before reporting timings
• measure cold and steady query latency, first-row latency, managed allocations, peak working set, and peak private memory in alternating fresh processes
• add a weekly/manual six-platform benchmark workflow and bilingual usage documentation

Validation

• 1,000 x 10 smoke benchmark, two iterations, both scenarios
• 100,000 x 10 stress benchmark, five iterations, both scenarios
• all parity checks passed before timing
• actionlint .github/workflows/nuget-benchmark.yml
• VS Code diagnostics: no errors

Local 100,000 x 10 result

• Cold median: MiniExcel 1983.10 ms; MiniExcel.Rust 1268.65 ms (1.56x)
• Steady median: MiniExcel 4715.19 ms; MiniExcel.Rust 3350.55 ms (1.41x)
• Managed allocation reduction: 88.6%

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 4dd6870 and 4167d8a.

📒 Files selected for processing (7)

• .github/workflows/nuget-benchmark.yml
• .gitignore
• benchmarks/nuget-v1-query/NuGetV1Query.csproj
• benchmarks/nuget-v1-query/Program.cs
• docs/dotnet-v1-query-benchmark.md
• docs/dotnet-v1-query-benchmark.zh-CN.md
• scripts/compare-nuget-v1-rust.ps1

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