chore: sync llm pricing from LiteLLM

[github-actions]

Automated daily refresh of data/llm_pricing.json from LiteLLM's price table.

Review checklist:

• Diff is plausible (no order-of-magnitude jumps that aren't matched by a public Anthropic / OpenAI announcement)
• No models silently disappeared (would zero-cost their token counts)
• cargo test fetcher::llm_pricing::tests::snapshot_parses_repo_seed passes — guards schema drift

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