fix: apply system color scheme for iOS in auto theme mode, closes #1762 (#1767)

apps/readest-app/src-tauri/plugins/tauri-plugin-native-bridge/src/lib.rs

@@ -51,6 +51,7 @@ pub fn init<R: Runtime>() -> TauriPlugin<R> {
             commands::iap_fetch_products,
             commands::iap_purchase_product,
             commands::iap_restore_purchases,
+            commands::get_system_color_scheme,
         ])
         .setup(|app, api| {
             #[cfg(mobile)]