Reworked the Hugging Face provider (#944)

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

@@ -0,0 +1,29 @@
+namespace AIStudio.Provider.HuggingFace;
+
+/// <summary>
+/// Which of the Hugging Face endpoints a provider instance talks to.
+/// </summary>
+/// <remarks>
+/// Hugging Face serves chatting and everything else from different places. Chat completions go to
+/// the router's own OpenAI-compatible endpoint, which accepts the model IDs as the hub writes them
+/// and picks an inference provider from a suffix. Embeddings and transcription do not exist there
+/// at all and have to be asked of one provider's own route. Because the base URL is fixed when a
+/// provider instance is built, the instance has to know from the start which one it is for.
+/// </remarks>
+public enum HFEndpointKind
+{
+    /// <summary>
+    /// The router's own endpoint, which serves chat completions.
+    /// </summary>
+    CHAT,
+
+    /// <summary>
+    /// The OpenAI-compatible route of one inference provider, which serves embeddings.
+    /// </summary>
+    EMBEDDING,
+
+    /// <summary>
+    /// The OpenAI-compatible route of one inference provider, which transcribes audio.
+    /// </summary>
+    TRANSCRIPTION,
+}