feat(frontend+backend): add theming to the blazor frontend

frontend/Models/Service.cs

@@ -0,0 +1,9 @@
+namespace NimbusFlow.Frontend.Models;
+
+public class Service
+{
+    public int ServiceId { get; set; }
+    public int ServiceTypeId { get; set; }
+    public DateTime ServiceDate { get; set; }
+    public string? ServiceTypeName { get; set; }
+}