Added backups of all data, restorable on another computer (#1008)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/DataBackup/DataBackupSettings.cs

@@ -0,0 +1,45 @@
+using System.Text.Json;
+
+using AIStudio.Settings;
+using AIStudio.Settings.DataModel;
+using AIStudio.Tools.PluginSystem;
+
+namespace AIStudio.Tools.DataBackup;
+
+/// <summary>
+/// The settings as a backup takes them along.
+/// </summary>
+public static class DataBackupSettings
+{
+    /// <summary>
+    /// Copies the settings, leaving out every object which a configuration plugin manages.
+    /// </summary>
+    /// <remarks>
+    /// A configuration plugin brings its providers, data sources, chat templates, profiles, and
+    /// policies back on another computer, along with their API keys. Restored from a backup as well,
+    /// they would compete with what the plugin brings, and without the plugin they would stay without
+    /// their keys: secrets never go into a backup. That holds for the configuration plugins of an
+    /// organization and for those the user installed, since a backup takes the latter along.<br/><br/>
+    ///
+    /// A setting which a configuration plugin locks stays in the copy, together with the plugin which
+    /// locks it. After a restore, the clean-up following the start of the plugins treats it like the
+    /// setting of a removed plugin, until the plugin locks it again. Without the plugin, the user gets
+    /// back the value they had chosen before.<br/><br/>
+    ///
+    /// The copy is a round trip through the format in which the settings are stored, so it shares
+    /// nothing with the settings AI Studio runs with. Like storing the settings, it reads them while
+    /// the rest of the app may still change them.
+    /// </remarks>
+    /// <param name="settings">The settings AI Studio runs with. They stay as they are.</param>
+    /// <returns>The copy for the backup.</returns>
+    public static Data CopyWithoutPluginObjects(Data settings)
+    {
+        var copy = JsonSerializer.Deserialize<Data>(JsonSerializer.Serialize(settings, SettingsManager.JSON_OPTIONS), SettingsManager.JSON_OPTIONS)
+                   ?? throw new InvalidOperationException("The settings could not be copied.");
+
+        foreach (var descriptor in PluginConfigurationObjectDescriptors.ALL)
+            descriptor.RemovePluginObjects(copy);
+
+        return copy;
+    }
+}