Support multiple web search backends: SearXNG, Staan, and Tavily (#948)

app/MindWork AI Studio/Tools/ToolCallingSystem/ToolSettingsGroupLink.cs

@@ -0,0 +1,15 @@
+namespace AIStudio.Tools.ToolCallingSystem;
+
+/// <summary>
+/// A link a tool offers next to one group of its settings.
+/// </summary>
+/// <remarks>
+/// This is where a group says how to obtain what it asks for: an account to create, a
+/// dashboard showing what is left of a quota, the documentation of a setting that cannot be
+/// explained in one help text. Without it, a field asking for an API key leaves the user to
+/// find out on their own where that key comes from.
+/// </remarks>
+/// <param name="Label">What the user reads on the button.</param>
+/// <param name="Url">Where the button leads. It opens in the browser, not in AI Studio.</param>
+/// <param name="Icon">The icon shown before the label.</param>
+public sealed record ToolSettingsGroupLink(string Label, string Url, string Icon = Icons.Material.Filled.OpenInBrowser);