Site Selection Strategy for Restaurant Chain Expansion in Urban Districts Based on Maximization of Customer Attraction and Profitability: ACKNOWLEDGEMENTS: This Work Was Supported by National Key Laboratory of Science and Technology on Helicopter Transmission(Nanjing University of Aeronautics and Astronautics)(Grant No. HTL-O-20K01) and Changzhou Science and Technology Planning Project(CE20225067). ISTAER 2025, 57-70.