Fix deepseek cache official api

[olweraltuve]

Fixed deepseek cache count

---

Important

Enhances DeepSeek API to support prompt caching and updates model info and tests accordingly.

• Behavior:
  • Updates DeepSeekHandler in deepseek.ts to support prompt caching by setting supportsPromptCache to true.
  • Adds cache metrics (cacheWriteTokens, cacheReadTokens) to processUsageMetrics() in deepseek.ts.
• Tests:
  • Updates deepseek.test.ts to include tests for cache metrics in createMessage() and processUsageMetrics().
  • Ensures getModel() returns correct model info with caching support.
• Models:
  • Updates deepSeekModels in api.ts to reflect new cache pricing and support.

^{This description was created by for 566fa0f. It will automatically update as commits are pushed.}

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Latest commit: 21101e2

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[mrubens]

Great, I think just one update needed to make the tests pass and we're good!

[olweraltuve]

I think everything looks good now.

[mrubens]

Thank you!