feat(app): clean architecture with typed repositories, DTO models and calendar event logos

FinlyticApp/lib/features/trades/models/close_trade_request_dto.dart

@@ -0,0 +1,12 @@
+/// Typed DTO for requesting a trade exit/close.
+class CloseTradeRequestDto {
+  final double userExitPrice;
+
+  const CloseTradeRequestDto({required this.userExitPrice});
+
+  Map<String, dynamic> toJson() {
+    return {
+      'userExitPrice': userExitPrice,
+    };
+  }
+}