feat(dashboard): 用量统计新增「昨天」范围 + 跨供应商「模型用量统计」选项卡

- 范围新增 yesterday：本地时区昨日 0 点 ~ 今日 0 点，range_end 引入上界过滤
- RangeStats 新增 modelsByName：按裸模型名聚合，同一模型跨供应商合并，
  子代理记录归入 __secondary__ 单独成行，按 Token 降序
- 趋势选项卡第 4 个 tab「模型用量统计」：新增 ModelTotalsChart 横向条形图，
  悬停显示请求数/Token/缓存命中/费用
- 概览卡网格扩展为 5 张；i18n 中英同步
- 顺带：pricing 测试基准从已下架的 moonshotai/kimi-k2.5 切换到 kimi-k3

src/i18n/en.ts

@@ -288,6 +288,7 @@ export const enTranslations: Record<TranslationKey, string> = {
 
   // Dashboard — ranges / status
   rangeToday: "Today",
+  rangeYesterday: "Yesterday",
   range7d: "7d",
   range30d: "30d",
   rangeAll: "All",
@@ -309,6 +310,7 @@ export const enTranslations: Record<TranslationKey, string> = {
   cardDailyTrendSubCapped: "Last 30 days · {n} days total",
   tabModelTrend: "Model usage trend",
   tabProviderTrend: "Provider–model usage trend",
+  tabModelTotals: "Model usage totals",
   tabDailyTrend: "Daily usage trend",
   providerUnknown: "Unknown provider",
   cardDailyTrendSub: "{n} days",

src/i18n/zh.ts

@@ -283,6 +283,7 @@ export const zhTranslations = {
 
   // Dashboard — ranges / status
   rangeToday: "今天",
+  rangeYesterday: "昨天",
   range7d: "7 天",
   range30d: "30 天",
   rangeAll: "全部",
@@ -304,6 +305,7 @@ export const zhTranslations = {
   cardDailyTrendSubCapped: "近 30 天 · 共 {n} 天",
   tabModelTrend: "模型用量趋势",
   tabProviderTrend: "供应商模型用量趋势",
+  tabModelTotals: "模型用量统计",
   tabDailyTrend: "每日用量趋势",
   providerUnknown: "未知供应商",
   cardDailyTrendSub: "共 {n} 天",