For streaming /v1/chat/completions: inject stream_options.include_usage, parse usage from SSE chunks, log actual ↑↓ tokens and wall time in the generator's finally block. Add elapsed time to all second log entries.
For streaming /v1/chat/completions: inject stream_options.include_usage, parse usage from SSE chunks, log actual ↑↓ tokens and wall time in the generator's finally block. Add elapsed time to all second log entries.