fix：树莓派检测

src/gps/controller.rs

@@ -54,7 +54,7 @@ pub struct GpsController {
     #[cfg(feature = "gpio")]
     pps_pin: Option<InputPin>,
     /// Placeholder for non-Linux platforms
-    #[cfg(not(target_os = "linux"))]
+    #[cfg(not(feature = "gpio"))]
     pps_pin: Option<()>,
     /// Last known position
     position: Arc<Mutex<GeoPosition>>,
@@ -93,7 +93,6 @@ impl GpsController {
         Ok(Self {
             config: gps_config,
             port: None,
-            #[cfg(feature = "gpio")]
             pps_pin: None,
             position: Arc::new(Mutex::new(initial_position)),
             sync_status: Arc::new(Mutex::new(SyncStatus::NoSync)),