feat(cli): show serverless pricing for supported models

[cursor]

Summary

• show SDK-provided serverless pricing in tg beta models public
• keep the pricing column hidden when no supported model has pricing data
• add CLI coverage for profile-backed and serverless-only supported models

Tests

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

  

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