✨ feat: Add model performance metrics to dashboard

Add a shared `performance-metrics` feature module for perf metric APIs, DTOs, and formatting, then surface global 24h model performance on the dashboard with cards and a top-model table.

Reuse the shared metrics module from pricing model details, remove duplicated perf API/formatting code from pricing, and add localized labels for the new dashboard performance UI.

web/default/src/i18n/locales/zh.json

@@ -2383,6 +2383,7 @@
     "More templates...": "更多模板...",
     "More...": "更多...",
     "Most-used models in the selected period and category": "所选时间范围与分类下使用率最高的模型",
+    "Monitored relay requests": "已监控的中继请求",
     "Move": "移动",
     "Move a request header": "移动请求头",
     "Move affiliate rewards to your main balance": "将推广奖励转移到您的主余额",
@@ -2555,6 +2556,7 @@
     "No payment methods configured": "暂无支付方式",
     "No payment methods configured. Click \"Add method\" or use templates to get started.": "未配置支付方式。点击\"添加方式\"或使用模板开始。",
     "No payment methods match your search": "没有匹配的支付方式",
+    "No performance data available": "暂无性能数据",
     "No plans available": "暂无可购买套餐",
     "No preference": "无偏好",
     "No prefill groups yet": "暂无预填充分组",
@@ -2849,6 +2851,7 @@
     "Percentage:": "百分比：",
     "Performance": "性能",
     "Performance data is not yet available for this model.": "该模型暂无性能数据。",
+    "Performance metrics for the last 24 hours": "最近 24 小时的性能指标",
     "Performance metrics shown here are simulated for preview purposes and will be replaced with live observability data once the backend integration is complete.": "此处展示的性能指标为预览模拟数据，待后端对接完成后将替换为真实可观测数据。",
     "Performance Monitor": "性能监控",
     "Performance Settings": "性能设置",
@@ -4330,6 +4333,7 @@
     "Weekly token usage by model since launch": "自上线以来按模型分布的每周 Token 使用量",
     "Weekly Window": "每周窗口",
     "Weight": "权重",
+    "Weighted by request count": "按请求数加权",
     "Welcome back!": "欢迎回来！",
     "Welcome to our New API...": "欢迎使用我们的 New API...",
     "Well-Known URL": "Well-Known URL",