Upload — Update-CurseForgeProjectFile

[MariusStorhaug]

Parent: #12

Implement Update-CurseForgeProjectFile for modifying existing uploaded files.

Acceptance criteria:

• Update-CurseForgeProjectFile updates file metadata via PATCH /projects/{projectId}/files/{fileId}
• -ProjectId (mandatory), -FileId (mandatory) parameters
• Updateable fields: displayName, changelog, changelogType, gameVersions, releaseType
• Returns updated file response
• -WhatIf and -Confirm support via SupportsShouldProcess
• Unit tests cover parameter validation and partial updates

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• Create src/functions/public/Upload/Update-CurseForgeProjectFile.ps1
• Create tests/Upload/Update-CurseForgeProjectFile.Tests.ps1