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/src/models.rs

@@ -139,3 +139,13 @@ pub struct ImmichAssetsPage {
 pub struct ImmichImportRequest {
     pub ids: Vec<String>,
 }
+
+#[derive(Debug, Clone, Default, Deserialize, Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct ImmichImportProgress {
+    pub active: bool,
+    pub completed: usize,
+    pub total: usize,
+    pub bytes_downloaded: u64,
+    pub bytes_total: u64,
+}