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/IStoredSecrets.cs

@@ -0,0 +1,23 @@
+namespace AIStudio.Tools.DataBackup;
+
+/// <summary>
+/// Tells whether the OS keyring of this computer holds a secret.
+/// </summary>
+public interface IStoredSecrets
+{
+    /// <summary>
+    /// Whether the API key of a provider is stored.
+    /// </summary>
+    /// <param name="secretId">The provider.</param>
+    /// <param name="storeType">The kind of provider.</param>
+    /// <returns>True when the key is stored.</returns>
+    public Task<bool> HasAPIKeyAsync(ISecretId secretId, SecretStoreType storeType);
+
+    /// <summary>
+    /// Whether another secret is stored, e.g., the password of a data source.
+    /// </summary>
+    /// <param name="secretId">What the secret belongs to.</param>
+    /// <param name="storeType">The kind of secret.</param>
+    /// <returns>True when the secret is stored.</returns>
+    public Task<bool> HasSecretAsync(ISecretId secretId, SecretStoreType storeType);
+}