add new OpenAI models: o4-mini and o3

Author: ccreutzi

+llms/+openai/models.m

@@ -19,5 +19,7 @@
         "o1-mini","o1-mini-2024-09-12",...
         "o1","o1-2024-12-17",...
         "o3-mini", "o3-mini-2025-01-31",...
+        "o4-mini", "o4-mini-2025-04-16",...
+        "o3", "o3-2025-04-16",...
     ];
 end