feat(import-progress): track and expose Immich import progress

This change introduces a cross-language import progress API for Immich
imports and exposes a new query command to report live progress. A
new ImportProgress model captures active state, totals, and bytes
downloaded, allowing consuming code to display import status to users.

- Adds ImportProgress data type and progress tracking during import
- Exposes get_immich_import_progress command in Android and Rust
- Updates permissions and schemas to include allow-get-immich-import-progress

plugins/android/src/main/java/WallpaperPlugin.kt

@@ -179,4 +179,8 @@ class WallpaperPlugin(private val activity: Activity) : Plugin(activity) {
       invoke.resolve(ImmichClient.importAssets(activity, args.ids.toList()))
     } catch (error: Exception) { invoke.reject(error.message ?: "Immich-Bilder konnten nicht importiert werden") }
   }
+
+  @Command fun getImmichImportProgress(invoke: Invoke) {
+    invoke.resolve(ImmichClient.importProgress())
+  }
 }