fix: 补齐 ATX 控制器缺失接口并完成全项目 clippy -D warnings 修复

src/atx/mod.rs

@@ -88,10 +88,7 @@ mod tests {
 
     #[test]
     fn test_discover_devices() {
-        let devices = discover_devices();
-        // Just verify the function runs without error
-        assert!(devices.gpio_chips.len() >= 0);
-        assert!(devices.usb_relays.len() >= 0);
+        let _devices = discover_devices();
     }
 
     #[test]