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

CaddyManager.Contracts/Models/Caddy/CaddyOperationResponse.cs

@@ -0,0 +1,23 @@
+namespace CaddyManager.Contracts.Models.Caddy;
+
+/// <summary>
+/// Class to wrap the response of a generic Caddy operation
+/// </summary>
+public class CaddyOperationResponse
+{
+    private string _message = string.Empty;
+
+    /// <summary>
+    /// Indicates if the operation was successful
+    /// </summary>
+    public bool Success { get; set; }
+
+    /// <summary>
+    /// Message to describe the operation result to provide more context
+    /// </summary>
+    public string Message
+    {
+        get => _message;
+        set => _message = value ?? string.Empty;
+    }
+}