Added an introduction and an onboarding chat to the BeyondFacts Lab (#1178)

app/MindWork AI Studio/Assistants/BeyondFactsLab/BflOnboardingPromptParts.cs

@@ -0,0 +1,9 @@
+namespace AIStudio.Assistants.BeyondFactsLab;
+
+/// <summary>
+/// The texts which the system prompt of the conversation about whether the lab fits a task is made of, as they come
+/// with the app.
+/// </summary>
+/// <param name="Onboarding">The prompt of the conversation with its placeholders.</param>
+/// <param name="Address">The instruction for the form of address.</param>
+public sealed record BflOnboardingPromptParts(string Onboarding, string Address);