metadata: name the upstream model instead of a local path

source.hf_model_id and language.tokenizer held an absolute path from the machine that did the export. Points them at the model the sibling decoder bundle names.

Found by conversion/zoo_verify.py in github.com/john-rocky/coreai-model-zoo.

layout/decoder/metadata.json

@@ -6,7 +6,7 @@
     "main": "mineru_decode_int8lin_pf64.aimodel"
   },
   "language": {
-    "tokenizer": "/Users/majimadaisuke/code/coreai/_mineru_dl",
+    "tokenizer": "tokenizer",
     "vocab_size": 151936,
     "max_context_length": 4096,
     "embedded_tokenizer": true,
@@ -19,11 +19,11 @@
   },
   "source": {
     "model_definition": "torch",
-    "hf_model_id": "/Users/majimadaisuke/code/coreai/_mineru_dl"
+    "hf_model_id": "opendatalab/MinerU2.5-Pro-2605-1.2B"
   },
   "compression": null,
   "compilation": {
     "date": "2026-07-06T07:41:10.859485+00:00",
     "targets": []
   }
-}
+}