Add SystemManager service

MediaBrowser.Controller/ISystemManager.cs

@@ -0,0 +1,34 @@
+using MediaBrowser.Model.System;
+using Microsoft.AspNetCore.Http;
+
+namespace MediaBrowser.Controller;
+
+/// <summary>
+/// A service for managing the application instance.
+/// </summary>
+public interface ISystemManager
+{
+    /// <summary>
+    /// Gets the system info.
+    /// </summary>
+    /// <param name="request">The HTTP request.</param>
+    /// <returns>The <see cref="SystemInfo"/>.</returns>
+    SystemInfo GetSystemInfo(HttpRequest request);
+
+    /// <summary>
+    /// Gets the public system info.
+    /// </summary>
+    /// <param name="request">The HTTP request.</param>
+    /// <returns>The <see cref="PublicSystemInfo"/>.</returns>
+    PublicSystemInfo GetPublicSystemInfo(HttpRequest request);
+
+    /// <summary>
+    /// Starts the application restart process.
+    /// </summary>
+    void Restart();
+
+    /// <summary>
+    /// Starts the application shutdown process.
+    /// </summary>
+    void Shutdown();
+}