chore: update project structure with contracts and services for CaddyManager, including configuration and Docker integration

CaddyManager.Contracts/Models/Caddy/CaddyDeleteOperationResponse.cs

@@ -0,0 +1,12 @@
+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Class to wrap the response of a Caddy delete operation
+/// </summary>
+public class CaddyDeleteOperationResponse : CaddyOperationResponse
+{
+    /// <summary>
+    /// List of configurations that were successfully deleted
+    /// </summary>
+    public List<string> DeletedConfigurations { get; set; } = [];
+}