Files — Get-CurseForgeFile with classes and enums

[MariusStorhaug]

Parent: #8

Implement Get-CurseForgeFile with all parameter sets, supporting classes, and enums for the Files domain.

Acceptance criteria:

• Get-CurseForgeFile works in three modes: single (modId+fileId), by mod (modId, paginated+filtered), batch (file IDs)
• Filters for by-mod mode: gameVersion, modLoaderType, gameVersionTypeId, index, pageSize
• CurseForgeFile class models the full file response
• Supporting classes: CurseForgeFileDependency, CurseForgeFileHash, CurseForgeFileModule, CurseForgeFileIndex, CurseForgeSortableGameVersion
• Enums: CurseForgeFileReleaseType, CurseForgeFileStatus, CurseForgeFileRelationType, CurseForgeHashAlgorithm
• Format file provides default table view
• Unit tests cover all three parameter sets

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• Create src/enums/CurseForgeFileReleaseType.ps1
• Create src/enums/CurseForgeFileStatus.ps1
• Create src/enums/CurseForgeFileRelationType.ps1
• Create src/enums/CurseForgeHashAlgorithm.ps1
• Create src/classes/public/CurseForgeFile.ps1
• Create src/classes/public/CurseForgeFileDependency.ps1
• Create src/classes/public/CurseForgeFileHash.ps1
• Create src/classes/public/CurseForgeFileModule.ps1
• Create src/classes/public/CurseForgeFileIndex.ps1
• Create src/classes/public/CurseForgeSortableGameVersion.ps1
• Create src/formats/CurseForgeFile.Format.ps1xml
• Create src/functions/public/Files/Get-CurseForgeFile.ps1
• Create tests/Files/Get-CurseForgeFile.Tests.ps1