feat(ops): add account switch metrics and trend

frontend/src/i18n/locales/en.ts

@@ -1955,6 +1955,7 @@ export default {
       waiting: 'waiting',
       conns: 'conns',
       queue: 'queue',
+      accountSwitches: 'Account switches',
       ok: 'ok',
       lastRun: 'last_run:',
       lastSuccess: 'last_success:',
@@ -2003,6 +2004,7 @@ export default {
       failedToLoadData: 'Failed to load ops data.',
       failedToLoadOverview: 'Failed to load overview',
       failedToLoadThroughputTrend: 'Failed to load throughput trend',
+      failedToLoadSwitchTrend: 'Failed to load avg account switches trend',
       failedToLoadLatencyHistogram: 'Failed to load request duration histogram',
       failedToLoadErrorTrend: 'Failed to load error trend',
       failedToLoadErrorDistribution: 'Failed to load error distribution',
@@ -2011,9 +2013,11 @@ export default {
       tpsK: 'TPS (K)',
       top: 'Top:',
       throughputTrend: 'Throughput Trend',
+      switchRateTrend: 'Avg Account Switches',
       latencyHistogram: 'Request Duration Histogram',
       errorTrend: 'Error Trend',
       errorDistribution: 'Error Distribution',
+      switchRate: 'Avg switches',
       // Health Score & Diagnosis
       health: 'Health',
       healthCondition: 'Health Condition',
@@ -2633,6 +2637,7 @@ export default {
       tooltips: {
         totalRequests: 'Total number of requests (including both successful and failed requests) in the selected time window.',
         throughputTrend: 'Requests/QPS + Tokens/TPS in the selected window.',
+        switchRateTrend: 'Trend of account switches / total requests over the last 5 hours (avg switches).',
         latencyHistogram: 'Request duration distribution (ms) for successful requests.',
         errorTrend: 'Error counts over time (SLA scope excludes business limits; upstream excludes 429/529).',
         errorDistribution: 'Error distribution by status code.',

frontend/src/i18n/locales/zh.ts

@@ -2103,6 +2103,7 @@ export default {
       waiting: '等待',
       conns: '连接',
       queue: '队列',
+      accountSwitches: '账号切换',
       ok: '正常',
       lastRun: '最近运行',
       lastSuccess: '最近成功',
@@ -2152,6 +2153,7 @@ export default {
       failedToLoadData: '加载运维数据失败',
       failedToLoadOverview: '加载概览数据失败',
       failedToLoadThroughputTrend: '加载吞吐趋势失败',
+      failedToLoadSwitchTrend: '加载平均账号切换趋势失败',
       failedToLoadLatencyHistogram: '加载请求时长分布失败',
       failedToLoadErrorTrend: '加载错误趋势失败',
       failedToLoadErrorDistribution: '加载错误分布失败',
@@ -2160,9 +2162,11 @@ export default {
       tpsK: 'TPS（千）',
       top: '最高：',
       throughputTrend: '吞吐趋势',
+      switchRateTrend: '平均账号切换趋势',
       latencyHistogram: '请求时长分布',
       errorTrend: '错误趋势',
       errorDistribution: '错误分布',
+      switchRate: '平均账号切换',
       // Health Score & Diagnosis
       health: '健康',
       healthCondition: '健康状况',
@@ -2787,6 +2791,7 @@ export default {
       tooltips: {
         totalRequests: '当前时间窗口内的总请求数和Token消耗量。',
         throughputTrend: '当前窗口内的请求/QPS 与 token/TPS 趋势。',
+        switchRateTrend: '近5小时内账号切换次数 / 请求总数的趋势（平均切换次数）。',
         latencyHistogram: '成功请求的请求时长分布（毫秒）。',
         errorTrend: '错误趋势（SLA 口径排除业务限制；上游错误率排除 429/529）。',
         errorDistribution: '按状态码统计的错误分布。',