feat(cli): add fine-tuning preview command

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Summary

• add tg fine-tuning preview / tg ft preview for the new client.fine_tuning.preview SDK endpoint
• expose preview parameters for model, training file, top-k rows, train-on-inputs, and training method
• cover JSON request payloads, table output, and JSON-mode smoke coverage

Tests

• python3 -m pytest tests/cli/test_fine_tuning.py -q
• python3 -m pytest tests/cli/test_json_mode_pipeable_to_jq.py::TestJSONMode::test_fine_tuning_json_mode -q

  

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