Implemented delete asset on device and on database (#22)

* refactor serving file function asset service
* Remove PhotoViewer for now since it creates a problem in 2.10
* Added error message for wrong decode file and logo for failed to load file
* Fixed error when read stream cannot be created and crash server
* Added method to get all assets as a raw array
* Implemented cleaner way of grouping image
* Implemented operation to delete assets in the database
* Implemented delete on database operation
* Implemented delete on device operation
* Fixed issue display wrong information when the auto backup is enabled after deleting all assets

mobile/lib/modules/home/models/delete_asset_response.model.dart

@@ -0,0 +1,52 @@
+import 'dart:convert';
+
+class DeleteAssetResponse {
+  final String id;
+  final String status;
+
+  DeleteAssetResponse({
+    required this.id,
+    required this.status,
+  });
+
+  DeleteAssetResponse copyWith({
+    String? id,
+    String? status,
+  }) {
+    return DeleteAssetResponse(
+      id: id ?? this.id,
+      status: status ?? this.status,
+    );
+  }
+
+  Map<String, dynamic> toMap() {
+    return {
+      'id': id,
+      'status': status,
+    };
+  }
+
+  factory DeleteAssetResponse.fromMap(Map<String, dynamic> map) {
+    return DeleteAssetResponse(
+      id: map['id'] ?? '',
+      status: map['status'] ?? '',
+    );
+  }
+
+  String toJson() => json.encode(toMap());
+
+  factory DeleteAssetResponse.fromJson(String source) => DeleteAssetResponse.fromMap(json.decode(source));
+
+  @override
+  String toString() => 'DeleteAssetResponse(id: $id, status: $status)';
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is DeleteAssetResponse && other.id == id && other.status == status;
+  }
+
+  @override
+  int get hashCode => id.hashCode ^ status.hashCode;
+}