Upload — Import-CurseForgeLocalization

[MariusStorhaug]

Parent: #13

Implement Import-CurseForgeLocalization for uploading localization data to a project.

Acceptance criteria:

• Import-CurseForgeLocalization calls POST /projects/{projectId}/localization/import
• -ProjectId (mandatory), -FilePath (mandatory) parameters
• Handles multipart/form-data with localization file
• Returns success/failure response
• -WhatIf and -Confirm support via SupportsShouldProcess
• Unit tests cover parameter validation and upload

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• Create src/functions/public/Upload/Import-CurseForgeLocalization.ps1
• Create tests/Upload/Import-CurseForgeLocalization.Tests.ps1