cli: add migration warning (#17620)

tools/main/main.cpp

@@ -521,6 +521,12 @@ int main(int argc, char ** argv) {
         is_interacting = params.interactive_first;
     }
 
+    LOG_WRN("*****************************\n");
+    LOG_WRN("IMPORTANT: The current llama-cli will be moved to llama-completion in the near future\n");
+    LOG_WRN("  New llama-cli will have enhanced features and improved user experience\n");
+    LOG_WRN("  More info: https://github.com/ggml-org/llama.cpp/discussions/17618\n");
+    LOG_WRN("*****************************\n");
+
     bool is_antiprompt        = false;
     bool input_echo           = true;
     bool display              = true;