Add one model host per provider and the unwrapping walk

app/MindWork AI Studio/Models/Hosting/Hosts/HostIONOS.cs

@@ -0,0 +1,24 @@
+using AIStudio.Models.Matching;
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Hosting.Hosts;
+
+/// <summary>
+/// The IONOS AI Model Hub, which keeps the hub spelling of the models it serves.
+/// </summary>
+/// <remarks>
+/// Its catalog reads like the hub's: "meta-llama/Llama-3.3-70B-Instruct",
+/// "mistralai/Mistral-Small-24B-Instruct". So the organization comes off, and with it comes the
+/// vendor -- stated rather than guessed from the name.
+/// </remarks>
+public sealed class HostIONOS : ModelHost
+{
+    /// <inheritdoc />
+    public override LLMProviders Provider => LLMProviders.IONOS;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://docs.ionos.com/cloud/ai/ai-model-hub", new DateOnly(2026, 9, 11), "Open weights named as the hub names them, served through the OpenAI-compatible chat completion API.");
+
+    /// <inheritdoc />
+    public override bool TryUnwrap(in ModelId id, out ModelId inner, out ModelVendor? declaredVendor) => HostNaming.TrySplitOrganization(id, out inner, out declaredVendor);
+}