fix(core): price OpenAI cached input tokens at the cache read rate - #13141
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OpenAI includes cached input in prompt_tokens and bills it at a discount, but calculateOpenAICost charged every prompt token at the full input rate, over-costing cache hits. Adds a cachedInput rate for the models that support prompt caching, prices the cached portion separately from the remaining input tokens, and shows a Cache Read line in the breakdown like the Anthropic branch does. Co-authored-by: Tony Coder <407243179@qq.com>
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Fixes #13104.
OpenAI cost used the full input rate for cached tokens. Cached tokens are now billed at the cache-read rate for models that support prompt caching (gpt-4o, gpt-4o-mini).
core/llm/utils/calculateRequestCost.vitest.ts: 27 passed.