README: fix citation block (use correct @article format with arXiv ID + full author list)

README.md

@@ -95,12 +95,11 @@ in the Space.
 ## Citation
 
 ```bibtex
-@misc{modellens2026,
-  title  = {ModelLens: Finding the Best Model for Your Task from Myriads of Models},
-  author = {Cai, Rui and Mo, Weijie Jacky and Wen, Xiaofei and Ma, Qiyao and
-            Zhu, Wenhui and Chen, Xiwen and Chen, Muhao and Zhao, Zhe},
-  year   = {2026},
-  url    = {https://huggingface.co/luisrui/ModelLens},
+@article{cai2026modellens,
+  title={ModelLens: Finding the Best for Your Task from Myriads of Models},
+  author={Cai, Rui and Mo, Weijie Jacky and Wen, Xiaofei and Ma, Qiyao and Zhu, Wenhui and Chen, Xiwen and Chen, Muhao and Zhao, Zhe},
+  journal={arXiv preprint arXiv:2605.07075},
+  year={2026}
 }
 ```