Add VLM fine-tuning training example

[prrao87]

Summary

• Add an end-to-end VLM fine-tuning training example for TextVQA
• Explain the LanceDB + Geneva workflow for cached vision features, tiered backfills, and PyTorch loading
• Add visual TextVQA example cards and benchmark/eval results

Validation

• UV_CACHE_DIR=/private/tmp/uv-cache-docs make snippets
• jq empty docs/docs.json
• Carefully inspected local build via mint dev

[mintlify]

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Project	Status	Preview	Updated (UTC)
lancedb-bcbb4faf	🟡 Building	–	Jun 23, 2026, 5:18 PM