feat: add Nemotron 3.5 model metadata

[pandemicsyn]

Summary

• register NVIDIA Nemotron 3.5 Lightning 30B A3B as an open-weights model
• link the official NVIDIA BF16 checkpoint on Hugging Face
• enable existing submissions for this model to appear in open-weights filters

Testing

• npm test (53 tests passed)
• git diff --check

[kilo-code-bot]

Code Review Summary

Status: No Issues Found | Recommendation: Merge

Files Reviewed (1 files)

• src/data/modelMetadata.ts

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_{Reviewed by claude-sonnet-5 · Input: 166 · Output: 1.7K · Cached: 138.4K}