feat: delta sync (#18428)

* feat: delta sync

* fix: ignore iCloud assets

* feat: dev logs

* add full sync button

* remove photo_manager dep for sync

* misc logs and fix

* add time taken to DLog

* fix: build release iOS

* ios sync go brrr

* rename local sync service

* update isar fork

* rename to platform assets / albums

* fix ci check

---------

Co-authored-by: shenlong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>
Co-authored-by: Alex <alex.tran1502@gmail.com>

mobile/pigeon/native_sync_api.dart

@@ -0,0 +1,89 @@
+import 'package:pigeon/pigeon.dart';
+
+@ConfigurePigeon(
+  PigeonOptions(
+    dartOut: 'lib/platform/native_sync_api.g.dart',
+    swiftOut: 'ios/Runner/Sync/Messages.g.swift',
+    swiftOptions: SwiftOptions(),
+    kotlinOut:
+        'android/app/src/main/kotlin/app/alextran/immich/sync/Messages.g.kt',
+    kotlinOptions: KotlinOptions(package: 'app.alextran.immich.sync'),
+    dartOptions: DartOptions(),
+    dartPackageName: 'immich_mobile',
+  ),
+)
+class PlatformAsset {
+  final String id;
+  final String name;
+  // Follows AssetType enum from base_asset.model.dart
+  final int type;
+  // Seconds since epoch
+  final int? createdAt;
+  final int? updatedAt;
+  final int durationInSeconds;
+
+  const PlatformAsset({
+    required this.id,
+    required this.name,
+    required this.type,
+    this.createdAt,
+    this.updatedAt,
+    this.durationInSeconds = 0,
+  });
+}
+
+class PlatformAlbum {
+  final String id;
+  final String name;
+  // Seconds since epoch
+  final int? updatedAt;
+  final bool isCloud;
+  final int assetCount;
+
+  const PlatformAlbum({
+    required this.id,
+    required this.name,
+    this.updatedAt,
+    this.isCloud = false,
+    this.assetCount = 0,
+  });
+}
+
+class SyncDelta {
+  final bool hasChanges;
+  final List<PlatformAsset> updates;
+  final List<String> deletes;
+  // Asset -> Album mapping
+  final Map<String, List<String>> assetAlbums;
+
+  const SyncDelta({
+    this.hasChanges = false,
+    this.updates = const [],
+    this.deletes = const [],
+    this.assetAlbums = const {},
+  });
+}
+
+@HostApi()
+abstract class NativeSyncApi {
+  bool shouldFullSync();
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  SyncDelta getMediaChanges();
+
+  void checkpointSync();
+
+  void clearSyncCheckpoint();
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  List<String> getAssetIdsForAlbum(String albumId);
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  List<PlatformAlbum> getAlbums();
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  int getAssetsCountSince(String albumId, int timestamp);
+
+  @TaskQueue(type: TaskQueueType.serialBackgroundThread)
+  List<PlatformAsset> getAssetsForAlbum(String albumId, {int? updatedTimeCond});
+}