Add Hobbies page, fix CI, and portfolio improvements

[marksmith1994]

Summary

• Hobbies page (/hobbies) — tabbed page with a Reading section (20 books, ratings, reviews, genre/year filters, Open Library covers) and a Travel section (photo gallery scaffolded and ready for holiday photos via wwwroot/data/hobbies-photos.json)
• CI fix — dotnet publish now targets MyPortfolio.csproj explicitly so the test project no longer breaks the publish step; test packages pinned to stable versions and marked IsPublishable=false
• GitHub token support — GitHubService now reads an optional GitHub__Token env var to raise the API rate limit from 60 to 5,000 req/hr
• Email config fix — README and CLAUDE.md now document the correct Email__GmailAddress / Email__GmailPassword env var names (ASP.NET Core __ convention) so the contact form actually sends
• OpenGraph — og:image updated to profile photo; twitter:card upgraded to summary_large_image
• PR build check — GitHub Actions now runs a build-only job on pull requests (no deploy)
• Unit tests — MyPortfolio.Tests project with 13 tests covering GitHubService and F1Service
• CLAUDE.md — codebase documentation for AI assistants

Adding travel photos

Drop images into wwwroot/images/hobbies/ and add entries to wwwroot/data/hobbies-photos.json:

{
  "trips": [
    {
      "title": "Portugal 2025",
      "year": 2025,
      "description": "Two weeks in Lisbon and the Algarve",
      "photos": [
        { "src": "/images/hobbies/portugal/lisbon.jpg", "caption": "Alfama at sunset", "location": "Lisbon" }
      ]
    }
  ]
}

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