0 或负数"到账余额"未校验：结果渲染 Infinity，负余额把负成本排成"最便宜" - #3
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版本：commit
17df24e（2026-09-09）script.js:213的recharge_amount / balance在 balance=0 时产生 Infinity（渲染 "Infinity CNY / Infinity USD"），balance<0 时产生负成本——且结果按升序排序，负成本条目会被排到第 1 名，直接污染比价排名（本工具的核心输出）。主计算链与汇率换算本身正确（实测 $3/$15 × 1M+1M = $18 ✓）。复现（A 级，跑其真实 script.js + jsdom）：余额 0 → Infinity；余额 -100 → 负成本且升至首位。
最小修复：提交前校验
balance > 0与recharge_amount > 0，非法输入禁用计算并给出提示。补丁方向已验证。