Threshold now represents remaining quota instead of usage amount: - Fixed ($): threshold=400, limit=1000 → alert when remaining drops to $400 (i.e., usage reaches $600) - Percentage (%): threshold=30%, limit=1000 → alert when remaining drops to 30% (i.e., usage reaches $700) Also: - Rename 告警阈值 → 提醒阈值 in i18n - Widen type dropdown to w-16 for proper $ / % display