docs: align citation with arXiv

Replace the outdated partial 2025 citation with the current official arXiv BibTeX, including the complete author list and 2026 metadata.

README.md

@@ -84,11 +84,14 @@ This benchmark is designed for researchers working on:
 If you use RoboBench in your research, please cite our paper:
 
 ```bibtex
-@article{luo2025robobench,
-  title={Robobench: A Comprehensive Evaluation Benchmark for Multimodal Large Language Models as Embodied Brain},
-  author={Luo, Yulin and Fan, Chun-Kai and Dong, Menghang and Shi, Jiayu and Zhao, Mengdi and Zhang, Bo-Wen and Chi, Cheng and Liu, Jiaming and Dai, Gaole and Zhang, Rongyu and others},
-  journal={arXiv preprint arXiv:2510.17801},
-  year={2025}
+@misc{luo2026robobenchcomprehensiveevaluationbenchmark,
+      title={Robobench: A Comprehensive Evaluation Benchmark for Multimodal Large Language Models as Embodied Brain}, 
+      author={Yulin Luo and Chun-Kai Fan and Menghang Dong and Jiayu Shi and Xiangju Mi and Mengdi Zhao and Bo-Wen Zhang and Cheng Chi and Jiaming Liu and Gaole Dai and Rongyu Zhang and Ruichuan An and Kun Wu and Zhengping Che and Shaoxuan Xie and Guocai Yao and Zhongxia Zhao and Pengwei Wang and Guang Liu and Zhongyuan Wang and Tiejun Huang and Shanghang Zhang},
+      year={2026},
+      eprint={2510.17801},
+      archivePrefix={arXiv},
+      primaryClass={cs.RO},
+      url={https://arxiv.org/abs/2510.17801}, 
 }
 ```