Add one model host per provider and the unwrapping walk

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

@@ -0,0 +1,20 @@
+using AIStudio.Provider;
+
+namespace AIStudio.Models.Hosting.Hosts;
+
+/// <summary>
+/// DeepSeek's own platform.
+/// </summary>
+/// <remarks>
+/// It names its models by what they are for rather than by which checkpoint answers: "deepseek-chat"
+/// and "deepseek-reasoner" both point at whatever is current. Those are aliases, not wrappings, so
+/// there is nothing to take off -- the rules answer for the alias itself.
+/// </remarks>
+public sealed class HostDeepSeek : ModelHost
+{
+    /// <inheritdoc />
+    public override LLMProviders Provider => LLMProviders.DEEP_SEEK;
+
+    /// <inheritdoc />
+    public override ModelSource Source => new("https://api-docs.deepseek.com/", new DateOnly(2026, 9, 11), "Models are named plainly, and the app reaches them through the OpenAI-compatible endpoint.");
+}