Added local RAG (#756)

Co-authored-by: Thorsten Sommer <SommerEngineering@users.noreply.github.com>

app/MindWork AI Studio/Tools/Services/TokenizerModelId.cs

@@ -0,0 +1,20 @@
+namespace AIStudio.Tools.Services;
+
+public static class TokenizerModelId
+{
+    public static string ForProvider(Settings.Provider provider) => ForProviderId(provider.Id);
+
+    public static string ForProviderId(string guid) => "chat_" + NormalizeGuid(guid);
+
+    public static string ForEmbeddingProvider(Settings.EmbeddingProvider provider) => ForEmbeddingProviderId(provider.Id);
+
+    public static string ForEmbeddingProviderId(string guid) => "embedding_" + NormalizeGuid(guid);
+
+    private static string NormalizeGuid(string guid)
+    {
+        if (Guid.TryParse(guid, out var parsedGuid))
+            return parsedGuid.ToString("D");
+
+        return guid.Trim();
+    }
+}