Add complete UI with sample images and MCP server

Refactor for HydroMorph mobile app compatibility

Update samples to download from URLs instead of local storage

Major UI overhaul: Model comparison, sample data, harmonized interface

Add SAM-Med3D, MedSAM-3D, and nnU-Net models with feature flags

Add TractSeg support, feature flags, and comprehensive NIfTI support

Add MCP-MedSAM support alongside MedSAM2

Refactor: Add MCP server support and improve API documentation

Add mcp_server=True to demo.launch()

MedSAM2 Gradio server with ZeroGPU