feat: request manage external storage permission when changing data directory to sdcard root on Android (#2142)

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

@@ -106,4 +106,10 @@ impl<R: Runtime> NativeBridge<R> {
     pub fn get_safe_area_insets(&self) -> crate::Result<GetSafeAreaInsetsResponse> {
         Err(crate::Error::UnsupportedPlatformError)
     }
+
+    pub fn request_manage_storage_permission(
+        &self,
+    ) -> crate::Result<RequestManageStoragePermissionResponse> {
+        Err(crate::Error::UnsupportedPlatformError)
+    }
 }