first commit

Services/Interfaces/IFirewallService.cs

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+using HanaToolbox.Config;
+
+namespace HanaToolbox.Services.Interfaces;
+
+public interface IFirewallService
+{
+    /// <summary>Applies the saved firewall config non-interactively (cron mode).</summary>
+    Task ApplyAsync(FirewallConfig config, CancellationToken ct = default);
+}