feat(cli): show supported model serverless pricing

[cursor]

Summary

• show serverless supported-model pricing in tg beta models public table output
• add focused CLI coverage for input, cached input, and output pricing

Tests

• python3 -m pytest tests/cli/test_beta_models.py -k 'TestBetaModelsPublic'
• python3 -m ruff check src/together/lib/cli/api/beta/models/public.py tests/cli/test_beta_models.py

  

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