Fixed GPT-6 Sol and Luna, and the system prompt role of newer OpenAI models (#1010)

app/MindWork AI Studio/Models/SystemPromptRole.cs

@@ -0,0 +1,36 @@
+namespace AIStudio.Models;
+
+/// <summary>
+/// Which role the system prompt is sent in.
+/// </summary>
+/// <remarks>
+/// A question only OpenAI's own cloud asks. Its models took their instructions as "system" first,
+/// then as "developer", and the early reasoning models took none at all, so that the instructions
+/// had to travel as a message of the person instead. Every other provider has one way to send a
+/// system prompt, and for their models the rules say nothing about this.
+///
+/// That the vendor's name is not in the members is on purpose: they say what the model accepts,
+/// and the provider decides how to spell that in its request.
+/// </remarks>
+public enum SystemPromptRole
+{
+    /// <summary>
+    /// No rule says anything about it, so the provider decides.
+    /// </summary>
+    UNKNOWN,
+
+    /// <summary>
+    /// The model takes its instructions in the system role.
+    /// </summary>
+    SYSTEM,
+
+    /// <summary>
+    /// The model takes its instructions in the developer role.
+    /// </summary>
+    DEVELOPER,
+
+    /// <summary>
+    /// The model takes no instructions of its own, so they go as a message of the person.
+    /// </summary>
+    USER,
+}