The Next Paradigm Is User-Centric Agent, Not Platform-Centric Service. - Luankang Zhang; Hang Lv 012; Qiushi Pan; Kefen Wang; Yonghao Huang; Xinrui Miao; Yin Xu; Wei Guo 006; Yong Liu 020; Hao Wang 076; Enhong Chen (CoRR, 2026)