GetAlbum and DownloadAlbum / Files (#9)

* feat: add Native AOT compatibility support

- Enable IsAotCompatible flag in project file
- Add JSON source generation context for AOT scenarios
- Add CatBoxApiErrorResponse model for structured error handling
- Configure ReSharper to enforce ConfigureAwait in library code
- Bump version to 1.1

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Co-Authored-By: Claude <noreply@anthropic.com>

* feat: add album file limit enforcement and safe upload

- Add MaxAlbumFiles constant (500) to Common class
- Add CatBoxAlbumFileLimitExceededException for limit violations
- Add Throw.IfAlbumFileLimitExceeds() validation helper
- Add AlbumUploadResult record for capacity-aware upload results
- Add URL parsing extensions (ToCatboxImageName, ToAlbumShortCode)
- Add ToListAsync extension for IAsyncEnumerable

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Co-Authored-By: Claude <noreply@anthropic.com>

* feat: add GetAlbum API and download support

- Add RequestType.GetAlbum enum value
- Add GetAlbumRequest and response models (AlbumInfo, GetAlbumApiResponse)
- Add ICatBoxClient.GetAlbumAsync() for retrieving album information
- Add file download support with DownloadFileAsync methods
- Add album download with DownloadAlbumAsync (yields FileInfo per file)
- Add UploadImagesToAlbumSafeAsync for capacity-aware uploads
- Improve retry policy to not retry client errors (4xx)
- Add ConfigureAwait(false) throughout for library best practices
- Replace ToBlockingEnumerable with async/await patterns

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Co-Authored-By: Claude <noreply@anthropic.com>

* test: add and update unit tests

- Add tests for album file limit validation (IfAlbumFileLimitExceeds)
- Add tests for URL parsing extensions (ToCatboxImageName, ToAlbumShortCode)
- Update integration tests to use proper async/await patterns
- Improve test coverage for CatBox and Litterbox clients

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

* chore: update IDE configuration

- Update VCS settings for branch protection

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Co-Authored-By: Claude <noreply@anthropic.com>

* Change test file location.

* Add integration tests. Update integration tests to use ToCatBoxImage name helper.

* Convert sample program to include a menu with api actions

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Co-authored-by: Claude <noreply@anthropic.com>

Author: ChaseDRedmon