fix: correct context size argument name in logging

The commit corrects the argument name used for logging the context size from `num_ctx` to `context_size` to match the actual parameter name, ensuring accurate logging output. This change improves code consistency and makes the log messages more readable.

src/main.py

@@ -69,7 +69,7 @@ def main():
     logging.info(f"Starting benchmarking for model: {args.model}")
     logging.info(f"Ollama URL: {args.ollama_url}")
     logging.info(f"Benchmarks to run: {', '.join(args.benchmarks)}")
-    logging.info(f"Context size: {args.num_ctx}")
+    logging.info(f"Context size: {args.context_size}")
 
     # Инициализация клиента
     ollama_client = OllamaClient(args.ollama_url)