fix: Normalize model pricing labels

[superhighfives]

Fixes pricing keys from #33421 that render as raw labels in model comparison tables, including output_text_tokens, output_video_tokens, and output_audio_tokens. Generalizes explicit per-million token labels while preserving non-token billing units.

[github-actions]

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Pattern	Owners
/src/util/models/	@ethulia, @kflansburg, @mchenco, @shridhar-cf, @superhighfives, @cloudflare/product-owners, @cloudflare/content-engineering

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