Refine prompt_template_source: lmms-eval/VLMEvalKit canonical citations

metadata.json

@@ -41,8 +41,9 @@
         }
       },
       "prompt_template_source": {
-        "origin": "fallback",
-        "reference": "T2"
+        "origin": "official",
+        "reference": "https://github.com/EvolvingLMMs-Lab/lmms-eval/blob/main/lmms_eval/tasks/mme/utils.py (mme_doc_to_text — bare question; answer is yes/no)",
+        "notes": "lmms-eval MME canonical evaluation prompt (perception/cognition yes/no eval)."
       }
     }
   }