refactor(overview): move usage panels to the Usage page

changelog/unreleased/usage-page-consolidation.md

@@ -0,0 +1,11 @@
+### English
+
+- Overview no longer carries the usage breakdown and credit deduction history panels; it keeps the gateway status, traffic, account pool, resources and ranking cards.
+- The credit expiry distribution moved from Overview to Usage, where it sits under the Stats tab and follows the same time window as the tables above it.
+- Overview and Usage both default to the "Today" window; Usage also offers Today on its Quota tab, which previously started at the full retained range.
+
+### 中文
+
+- 概览移除「用量明细」与「积分扣除历史」，只保留网关状态、流量、账号池、资源与排行卡片。
+- 「积分到期分布」从概览移到用量页，位于「统计」标签页内，并跟随上方表格的时间窗口。
+- 概览与用量页的时间查询都默认「今天」；用量页的「额度」标签页也新增「今天」，此前默认是全部留存范围。

frontend/src/api/logs.ts

@@ -176,63 +176,6 @@ export type RequestStats = {
   series: RequestStatsPoint[]
 }
 
-export type RequestUsageTotals = {
-  total_tokens: number
-  prompt_tokens: number
-  completion_tokens: number
-  cache_hit_tokens: number
-  cache_miss_tokens: number
-  requests: number
-  errors: number
-  avg_latency_ms?: number | null
-  avg_tokens_per_second?: number | null
-  credits: number
-  credit_tokens: number
-  credit_samples: number
-  credits_per_1m_tokens?: number | null
-  success_rate: number
-}
-
-export type RequestUsageRow = {
-  key: string
-  realm?: string
-  extra?: string
-  total_tokens: number
-  prompt_tokens: number
-  completion_tokens: number
-  cache_hit_tokens: number
-  cache_miss_tokens: number
-  requests: number
-  errors: number
-  avg_latency_ms?: number | null
-  avg_tokens_per_second?: number | null
-}
-
-export type RequestUsageCreditRow = {
-  key: string
-  nickname?: string
-  realm?: string
-  rate?: number | null
-  requests: number
-  credit_samples: number
-  credits: number
-  credit_tokens: number
-  credits_per_1m_tokens?: number | null
-  cache_hit_tokens: number
-  cache_miss_tokens: number
-}
-
-export type RequestUsage = {
-  window: RequestStatsWindow
-  totals: RequestUsageTotals
-  by_account: RequestUsageRow[]
-  by_model: RequestUsageRow[]
-  by_realm: RequestUsageRow[]
-  credit_by_account: RequestUsageCreditRow[]
-  credit_by_model: RequestUsageCreditRow[]
-  series: RequestStatsPoint[]
-}
-
 export type RequestLogQuery = {
   account?: string
   status?: string
@@ -264,15 +207,6 @@ export function fetchRequestStats(query: { hours?: number; from?: string; to?: s
   return api<RequestStats>(`/api/logs/stats${suffix}`)
 }
 
-export function fetchRequestUsage(query: { hours?: number; from?: string; to?: string } = {}) {
-  const params = new URLSearchParams()
-  if (query.hours != null) params.set('hours', String(query.hours))
-  if (query.from) params.set('from', query.from)
-  if (query.to) params.set('to', query.to)
-  const suffix = params.toString() ? `?${params}` : ''
-  return api<RequestUsage>(`/api/logs/usage${suffix}`)
-}
-
 export function fetchRequestLogs(query: RequestLogQuery = {}) {
   const params = new URLSearchParams()
   if (query.account) params.set('account', query.account)