ci: add NuGet publish workflow on tag push

[devin-ai-integration]

Summary

Add .github/workflows/publish.yml — a GitHub Actions workflow that publishes NuGet packages when a v* tag is pushed.

Workflow details:

• Triggers on v* tag push (e.g. git tag v1.0.0 && git push origin v1.0.0)
• Extracts the version number from the tag and passes it via /p:Version= to override any hardcoded version in .csproj
• Restores, builds, and runs tests before packing
• Packs both AxisEndpoints and AxisEndpoints.Extensions.CsvHelper
• Pushes .nupkg files to NuGet.org using NUGET_API_KEY secret with --skip-duplicate
• Uses .NET 10.0.x to match the net10.0 target framework

Review & Testing Checklist for Human

• Verify NUGET_API_KEY repository secret is configured (NuGet.org → API Keys)
• If .NET 10 is still in preview, consider adding include-prerelease: true to the actions/setup-dotnet step
• Test by creating a tag: git tag v0.0.1-test && git push origin v0.0.1-test and verifying the workflow runs

Notes

• The workflow uses --skip-duplicate so re-pushing an existing version won't fail.
• Since the project targets net10.0, the dotnet-version is set to 10.0.x.

Link to Devin session: https://app.devin.ai/sessions/2497a3064d034ccc8793e43de0ca6235
Requested by: @sheepla

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[devin-ai-integration]

✅ Devin Review: No Issues Found

Devin Review analyzed this PR and found no potential bugs to report.

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