Add one model host per provider and the unwrapping walk

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

@@ -0,0 +1,36 @@
+using AIStudio.Models.Matching;
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Hosting.Hosts;
+
+/// <summary>
+/// The Hugging Face router, whose names carry two wrappings rather than one.
+/// </summary>
+/// <remarks>
+/// "google/gemma-4-31B-it:novita" says three things at once: who published the weights, which model
+/// it is, and which inference provider should answer. The suffix goes first, because it is the
+/// outermost and because it says nothing about the model -- a request routed to Novita and one
+/// routed to Together AI reach the same weights.
+///
+/// This is the case the whole walk was written for. A host which took both off at once would work
+/// here and nowhere else; taking one off at a time is what also covers the account path Fireworks
+/// puts in front, without either host knowing about the other.
+/// </remarks>
+public sealed class HostHuggingFace : ModelHost
+{
+    /// <inheritdoc />
+    public override LLMProviders Provider => LLMProviders.HUGGINGFACE;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://huggingface.co/docs/inference-providers/index", new DateOnly(2026, 9, 11), "Models are named as the hub names them, \"organization/model\", optionally followed by a colon and the inference provider to route to.");
+
+    /// <inheritdoc />
+    public override bool TryUnwrap(in ModelId id, out ModelId inner, out ModelVendor? declaredVendor)
+    {
+        declaredVendor = null;
+        if (HostNaming.TryStripRoutingSuffix(id, out inner))
+            return true;
+
+        return HostNaming.TrySplitOrganization(id, out inner, out declaredVendor);
+    }
+}