refactor(mobile): use repositories in a number of services (#12891)

* UserService
* PartnerService
* HashService
* MemoryService
* PersonService
* SearchService
* StackService

mobile/lib/interfaces/person_api.interface.dart

@@ -0,0 +1,22 @@
+abstract interface class IPersonApiRepository {
+  Future<List<Person>> getAll();
+  Future<Person> update(String id, {String? name});
+}
+
+class Person {
+  Person({
+    required this.id,
+    required this.isHidden,
+    required this.name,
+    required this.thumbnailPath,
+    this.birthDate,
+    this.updatedAt,
+  });
+
+  final String id;
+  final DateTime? birthDate;
+  final bool isHidden;
+  final String name;
+  final String thumbnailPath;
+  final DateTime? updatedAt;
+}