Spacetime Substantivalism XI: Restoration of the Physical Mechanism of the Lorentz Transformation — An Audit Model Based on Electromagnetic Load and the v²epsilon₀mu₀ Term (时空实体论 XI: 洛伦兹变换物理机制的还原 —— 基于电磁负载与 v²epsilon₀mu₀ 项的审计模型) | Synapse