Dev 130386622f feat(10-01): create BrandingService with magic byte validation and auto-compression ...

- Add IBrandingService interface with ImportLogoAsync, Save/Clear/GetMspLogoAsync
- Add BrandingService: PNG/JPEG magic byte detection, rejects unsupported formats with
  descriptive error, auto-compresses files over 512 KB using WPF PresentationCore imaging
- Add BrandingServiceTests: 9 tests covering validation, rejection, compression, CRUD
- Deviation: used WPF BitmapEncoder/TransformedBitmap instead of System.Drawing.Bitmap
  (System.Drawing.Common not available without new NuGet package; WPF PresentationCore
  is in the existing stack per architectural decisions)

2026-04-08 12:32:23 +02:00

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