fix(langfuse): use Langfuse-standard keys in usageDetails#107
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The usageDetails keys (inputTokens, outputTokens, promptTokens, etc.) did not match Langfuse's expected naming convention (input, output, total, etc.), preventing cost inference and correct UI aggregation.
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Summary
usageDetailskeys in the Langfuse middleware to match Langfuse's expected naming convention (input,output,total,cache_read_input,cache_creation_input,reasoning_output) instead of custom keys (inputTokens,outputTokens,promptTokens,completionTokens,cacheReadInputTokens,cacheWriteInputTokens,reasoningOutputTokens)input/output) and correct UI aggregation (Langfuse groups usage types by substring matching oninput/output)Test plan