Ostrakon-VL: Towards Domain-Expert MLLM for Food-Service and Retail Stores. - Zhiyong Shen; Gongpeng Zhao; Jun Zhou; Li Yu; Guandong Kou; Jichen Li; Chuanlei Dong; Zuncheng Li; Kaimao Li; Bingkun Wei; Shicheng Hu; Wei Xia; et al. (CoRR, 2026)