feat: add cost field to providerMetadata usage

[wladimiiir]

Summary

Adds the cost field from response.usage.cost into providerMetadata.requesty.usage, alongside existing cachingTokens and cachedTokens.

Changes

• src/types.ts — Added cost?: number to RequestyUsage type
• src/requesty-chat-language-model.ts — Include cost from response.usage.cost in doGenerate providerMetadata; added cost to RequestyStreamChatCompletionChunkSchema usage Zod schema
• src/stream/index.ts — Extract cost in handleUsageChunk; forward cost in createFlush providerMetadata

Usage

The cost is now available in providerMetadata.requesty.usage.cost for both doGenerate and streaming responses:

const result = await generateText({
  model: requesty('...'),
  prompt: '...',
})

const cost = result.providerMetadata?.requesty?.usage?.cost

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