Add KonfAI extension

[vboussot]

New extension

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This PR adds SlicerKonfAI, a new extension providing a graphical interface in 3D Slicer to run KonfAI Apps for medical image segmentation, synthetic CT generation, and related deep learning tasks.

SlicerKonfAI serves as the backend architecture for upcoming tools, including:

• ImpactSynth – MR-to-CT and CBCT-to-CT medical image synthesis
• ImpactReg – multimodal deformable registration

These applications will be packaged as KonfAI Apps and executed seamlessly within SlicerKonfAI.

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Pre-included Apps and Models

This initial release already ships with several ready-to-use models:

Medical image synthesis

• MR and CBCT ➜ CT synthesis

Segmentation

• TotalSegmentator and MRSegmentator integrated via KonfAI
  (improved inference performance)

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Main capabilities

• Load volumes directly from Slicer and run KonfAI Apps
• GPU acceleration when available
• Visualization of predictions as segmentations or volumes
• Optional evaluation and uncertainty estimation workflows
• Automatic download and versioning of Apps hosted on Hugging Face
• Extensible design for adding new KonfAI apps