Refactor. Add data layer

BudgetApp/Services/Models/DashboardData.cs

@@ -0,0 +1,14 @@
+
+using BudgetApp.Data.Entities;
+
+namespace BudgetApp.Services.Models;
+
+public class DashboardData
+{
+    public List<Account> Accounts { get; set; } = [];
+    public List<Category> Categories { get; set; } = [];
+    public List<Transaction> RecentTransactions { get; set; } = [];
+    public List<Transaction> UpcomingTransactions { get; set; } = [];
+    public ChartData ChartData { get; set; } = new();
+    public string CurrencySymbol { get; set; } = "$";
+}