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

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

app/MindWork AI Studio/Settings/DataModel/Data.cs

@@ -116,6 +116,16 @@ public sealed class Data
     /// </remarks>
     public List<string> AppliedEnterpriseAssistantActivations { get; set; } = [];
 
+    /// <summary>
+    /// Whether AI Studio already stored the chats and the settings once more, so that every path below
+    /// the data directory in them is relative.
+    /// </summary>
+    /// <remarks>
+    /// Compatibility shim, see documentation/compatibility-shims/2026-10-relative-data-paths.md.
+    /// Remove after 2027-04-14.
+    /// </remarks>
+    public bool StoredDataPathsAreRelative { get; set; }
+
     /// <summary>
     /// The next provider number to use.
     /// </summary>

app/MindWork AI Studio/Settings/DataModel/DataApp.cs

@@ -219,6 +219,24 @@ public sealed class DataApp(Expression<Func<Data, DataApp>>? configSelection = n
     /// </summary>
     public bool AllowUserToSharePlugins { get; set; } = ManagedConfiguration.Register(configSelection, n => n.AllowUserToSharePlugins, true);
 
+    /// <summary>
+    /// Should the user be allowed to back up the data of AI Studio into a file?
+    /// </summary>
+    /// <remarks>
+    /// A backup holds chats and other confidential content in a single file, which can leave the
+    /// computer on any stick or cloud drive. Secrets never go into it.
+    /// </remarks>
+    public bool AllowUserToBackUpData { get; set; } = ManagedConfiguration.Register(configSelection, n => n.AllowUserToBackUpData, true);
+
+    /// <summary>
+    /// Should the user be allowed to restore the data of AI Studio from a backup file, or to add the chats of one?
+    /// </summary>
+    /// <remarks>
+    /// A backup brings along everything its chats and settings name, including the locations of
+    /// attached documents and of local data sources, which are read again afterward.
+    /// </remarks>
+    public bool AllowUserToRestoreData { get; set; } = ManagedConfiguration.Register(configSelection, n => n.AllowUserToRestoreData, true);
+
     /// <summary>
     /// Should administration settings be visible in the UI?
     /// </summary>