Added IONOS as a provider and unified how providers sort their model lists (#941)

app/MindWork AI Studio/Provider/ModelKind.cs

@@ -0,0 +1,69 @@
+namespace AIStudio.Provider;
+
+/// <summary>
+/// The kind of an AI model, i.e. what the model is made for.
+/// </summary>
+/// <remarks>
+/// This describes what kind of model we are dealing with. It answers a different question than the
+/// Capability enum: capabilities describe what a chat model is able to do, for example whether it
+/// accepts images or performs reasoning. Note that Capability.EMBEDDING marks a chat model which is
+/// able to create embeddings as well, whereas ModelKind.EMBEDDING marks a model whose only purpose
+/// is creating embeddings.
+/// </remarks>
+public enum ModelKind
+{
+    /// <summary>
+    /// The model is used for chat completions.
+    /// </summary>
+    /// <remarks>
+    /// This is the fallback: we report a model as a chat model whenever we do not recognize any
+    /// other kind. Providers keep adding models we have never heard of, and a model we fail to
+    /// recognize must stay visible to the user instead of silently disappearing from their list.
+    /// </remarks>
+    CHAT,
+
+    /// <summary>
+    /// The model continues a text instead of answering in a conversation.
+    /// </summary>
+    /// <remarks>
+    /// These are the models from the era before chat completions, such as OpenAI's text-davinci-003.
+    /// Some providers still offer them, but they only work through the completions endpoint. Asking
+    /// them for a chat completion fails, so they must not show up as chat models.
+    /// </remarks>
+    TEXT_COMPLETION,
+
+    /// <summary>
+    /// The model maps text or images into a vector space.
+    /// </summary>
+    EMBEDDING,
+
+    /// <summary>
+    /// The model scores documents against a query to reorder search results.
+    /// </summary>
+    RERANKING,
+
+    /// <summary>
+    /// The model generates or edits images.
+    /// </summary>
+    IMAGE_GENERATION,
+
+    /// <summary>
+    /// The model transcribes audio into text.
+    /// </summary>
+    TRANSCRIPTION,
+
+    /// <summary>
+    /// The model synthesizes speech from text.
+    /// </summary>
+    SPEECH_SYNTHESIS,
+
+    /// <summary>
+    /// The model extracts text from images or scanned documents.
+    /// </summary>
+    OCR,
+
+    /// <summary>
+    /// The model classifies content for policy violations.
+    /// </summary>
+    MODERATION,
+}