feat(nvidia): mark unused params in get_system_metrics

Mark current_tokens and max_tokens parameters as unused in get_system_metrics function by prefixing them with underscores. This change clarifies that these parameters are intentionally unused in the function implementation while maintaining the function signature for potential future use.

src/nvidia/mod.rs

@@ -10,7 +10,7 @@ pub struct SystemMetrics {
 }
 
 /// Gets current system metrics
-pub fn get_system_metrics(current_tokens: usize, max_tokens: usize) -> Result<SystemMetrics> {
+pub fn get_system_metrics(_current_tokens: usize, _max_tokens: usize) -> Result<SystemMetrics> {
     let mut sys = System::new();
     sys.refresh_cpu_usage();