Update ai_engine.js

ai_engine.js

@@ -19,7 +19,8 @@ const getModelId = (modelName) => {
            // return "meta-llama/llama-4-maverick";
         case "llama-3.2-11b":
              return "meta-llama/llama-3.2-11b-vision-instruct:free";
-        
+      case "qwen-2-vl-7b":
+            return "qwen/qwen-2-vl-7b-instruct:free";
         case "gpt":
         case "gpt-5.4-nano":
             return "openai/gpt-5.4-nano";