Update pricing to support all composer models

[RawToast]

There was no support for composer 1, composer 2, and composer 2 fast

Followed the same patterns as the 1.5 implementation #299

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Summary by cubic

Add pricing support for Composer 1, Composer 2, and Composer 2 Fast to enable accurate cost calculation and Cursor CSV re-pricing. Handles spaced and hyphenated model IDs and treats cache writes as free for Composer 2 variants.

• New Features
  • Added pricing entries for composer 1/composer-1, composer 2/composer-2, and composer 2 fast/composer-2-fast based on Cursor docs.
  • Cache read priced; cache write is free for Composer 2 and 2 Fast.
  • CSV re-pricing now assigns non-zero costs for these models when source rows report zero.
  • Tests cover lookup, cost calculation, alias matching, and cache-write-free behavior.

^{Written for commit 75321ee. Summary will update on new commits.}

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[cubic-dev-ai]

No issues found across 2 files

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