refactor(mobile): server info to use data classes instead of dtos (#4591)

* refactor: server info model to use data classes instead of dtos

* mobile: add return types and refactor private variables in map / stack

---------

Co-authored-by: shalong-tanwen <139912620+shalong-tanwen@users.noreply.github.com>

mobile/lib/shared/models/server_info/server_config.model.dart

@@ -0,0 +1,44 @@
+import 'package:openapi/api.dart';
+
+class ServerConfig {
+  final int trashDays;
+  final String mapTileUrl;
+
+  const ServerConfig({
+    required this.trashDays,
+    required this.mapTileUrl,
+  });
+
+  ServerConfig copyWith({
+    int? trashDays,
+    String? mapTileUrl,
+  }) {
+    return ServerConfig(
+      trashDays: trashDays ?? this.trashDays,
+      mapTileUrl: mapTileUrl ?? this.mapTileUrl,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'ServerConfig(trashDays: $trashDays, mapTileUrl: $mapTileUrl)';
+  }
+
+  ServerConfig.fromDto(ServerConfigDto dto)
+      : trashDays = dto.trashDays,
+        mapTileUrl = dto.mapTileUrl;
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is ServerConfig &&
+        other.trashDays == trashDays &&
+        other.mapTileUrl == mapTileUrl;
+  }
+
+  @override
+  int get hashCode {
+    return trashDays.hashCode ^ mapTileUrl.hashCode;
+  }
+}