v15 + 半场策略上线：Day1-2亏损，阿森纳德比累积单日拉回v15 + half-time strategy: early losses, Arsenal derby accumulators recovery
模型：v15｜新增：半场（HT）策略模块（自R28起）Model: v15 | New: Half-Time (HT) strategy module (from R28)