Added mailboxes as local data sources (#1022)

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

@@ -0,0 +1,31 @@
+namespace AIStudio.Settings.DataModel;
+
+/// <summary>
+/// Where a chat may still send data, once it has read from a mailbox.
+/// </summary>
+/// <remarks>
+/// The members run from the strictest to the most permissive, so the stricter of two levels is the
+/// smaller one. Services which are configured in AI Studio, such as Confluence or the mailbox itself,
+/// stay allowed on every level.
+/// </remarks>
+public enum OutboundDataRestriction
+{
+    // The strictest level is deliberately the member with the underlying value 0: when the settings
+    // file holds a value TolerantEnumConverter cannot read, it falls back to that member. Falling back
+    // to a more permissive level would open a way out for mail content the user meant to keep in.
+
+    /// <summary>
+    /// Only the services configured in AI Studio.
+    /// </summary>
+    ONLY_CONFIGURED_SERVICES = 0,
+
+    /// <summary>
+    /// The configured services, and the addresses written in the chat, either by the user or in the result of a tool. No searches with third-party services.
+    /// </summary>
+    ONLY_LINKS_FROM_CHAT,
+
+    /// <summary>
+    /// No restriction beyond the ones of each tool.
+    /// </summary>
+    UNRESTRICTED,
+}