Add B200 accelerator type support

[atif1996]

Problem

AICR currently recognizes a100, gb200, h100, and l40 accelerators but does not support the standalone Blackwell B200 GPU. Clusters with nvidia.com/gpu.product=NVIDIA-B200 (Blackwell family, compute 10.0) are detected as accelerator=any, preventing GPU-specific overlay matching.

Solution

Add b200 as a recognized CriteriaAcceleratorType in the criteria system and snapshot detection.

Changes needed

• Add CriteriaAcceleratorB200 constant to pkg/recipe/criteria.go
• Add B200 detection to matchAccelerator() in pkg/recipe/snapshot.go
• Add test cases for parsing and snapshot detection