Add one model host per provider and the unwrapping walk

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

@@ -0,0 +1,25 @@
+using AIStudio.Models.Matching;
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Hosting.Hosts;
+
+/// <summary>
+/// Fireworks AI, which puts a whole account path in front of every model.
+/// </summary>
+/// <remarks>
+/// "accounts/fireworks/models/llama-v3p1-405b-instruct" is three segments of path and then the
+/// model. Nothing here counts them: the same taking-off-one-segment the gateways use is asked
+/// again until there is no path left. None of the three segments names a vendor we know, so none
+/// of them claims to.
+/// </remarks>
+public sealed class HostFireworks : ModelHost
+{
+    /// <inheritdoc />
+    public override LLMProviders Provider => LLMProviders.FIREWORKS;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://fireworks.ai/models?show=Serverless", new DateOnly(2026, 9, 11), "Models are named \"accounts/<account>/models/<model>\", 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);
+}