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_version.model.dart

@@ -0,0 +1,50 @@
+import 'package:openapi/api.dart';
+
+class ServerVersion {
+  final int major;
+  final int minor;
+  final int patch;
+
+  const ServerVersion({
+    required this.major,
+    required this.minor,
+    required this.patch,
+  });
+
+  ServerVersion copyWith({
+    int? major,
+    int? minor,
+    int? patch,
+  }) {
+    return ServerVersion(
+      major: major ?? this.major,
+      minor: minor ?? this.minor,
+      patch: patch ?? this.patch,
+    );
+  }
+
+  @override
+  String toString() {
+    return 'ServerVersion(major: $major, minor: $minor, patch: $patch)';
+  }
+
+  ServerVersion.fromDto(ServerVersionResponseDto dto)
+      : major = dto.major,
+        minor = dto.minor,
+        patch = dto.patch_;
+
+  @override
+  bool operator ==(Object other) {
+    if (identical(this, other)) return true;
+
+    return other is ServerVersion &&
+        other.major == major &&
+        other.minor == minor &&
+        other.patch == patch;
+  }
+
+  @override
+  int get hashCode {
+    return major.hashCode ^ minor.hashCode ^ patch.hashCode;
+  }
+}