Read the context window from four more model lists

app/MindWork AI Studio/Provider/HuggingFace/HFModelProvider.cs

@@ -1,3 +1,5 @@
+using System.Text.Json.Serialization;
+
 namespace AIStudio.Provider.HuggingFace;
 
 /// <summary>
@@ -5,4 +7,13 @@ namespace AIStudio.Provider.HuggingFace;
 /// </summary>
 /// <param name="Provider">The slug of the inference provider, e.g. "novita".</param>
 /// <param name="Status">Whether the provider currently serves the model. Known value: "live".</param>
-public readonly record struct HFModelProvider(string Provider, string Status);
+/// <param name="ContextWindowTokens">How much this provider reads and writes in one conversation, in tokens.</param>
+public readonly record struct HFModelProvider(string Provider, string Status, [property: JsonPropertyName("context_length")] int? ContextWindowTokens)
+{
+    private const string LIVE = "live";
+
+    /// <summary>
+    /// Whether this provider serves the model right now.
+    /// </summary>
+    public bool IsLive => string.Equals(this.Status, LIVE, StringComparison.OrdinalIgnoreCase);
+}