feat: update gateway pool and usage flows

frontend/src/features/usage/components/HorizontalRequestTimeline.vue

@@ -662,19 +662,6 @@ const formatNumber = (num: number): string => {
   return num.toLocaleString('zh-CN')
 }
 
-// 计算最终状态：优先检查进行中状态，再使用外部状态码
-const computedFinalStatus = computed(() => {
-  const hasPending = trace.value?.candidates?.some(
-    c => c.status === 'pending' || c.status === 'streaming'
-  )
-  return resolveTimelineFinalStatus({
-    hasPendingCandidates: hasPending,
-    statusCode: props.overrideStatusCode,
-    requestStatus: props.requestStatus ?? usageData.value?.status,
-    traceFinalStatus: trace.value?.final_status,
-  })
-})
-
 // 获取最终状态标签
 const getFinalStatusLabel = (status: string) => {
   const labels: Record<string, string> = {
@@ -806,11 +793,25 @@ const STATUS_PRIORITY: Record<string, number> = {
 }
 
 const isParticipatedCandidate = (candidate: CandidateRecord): boolean => {
-  if (candidate.status === 'available' || candidate.status === 'unused') return false
-  if (candidate.status === 'pending' && !candidate.started_at) return false
-  return true
+  return TIMELINE_STATUS.includes(candidate.status)
 }
 
+const isLiveCandidate = (candidate: CandidateRecord): boolean => {
+  if (candidate.status === 'streaming') return true
+  return candidate.status === 'pending' && Boolean(candidate.started_at)
+}
+
+// 计算最终状态：优先检查真正已启动的进行中状态，再使用外部状态码
+const computedFinalStatus = computed(() => {
+  const hasPending = trace.value?.candidates?.some(isLiveCandidate)
+  return resolveTimelineFinalStatus({
+    hasPendingCandidates: hasPending,
+    statusCode: props.overrideStatusCode,
+    requestStatus: props.requestStatus ?? usageData.value?.status,
+    traceFinalStatus: trace.value?.final_status,
+  })
+})
+
 const compareBySchedulingOrder = (a: CandidateRecord, b: CandidateRecord): number => {
   if (a.candidate_index !== b.candidate_index) {
     return a.candidate_index - b.candidate_index
@@ -1695,10 +1696,7 @@ const propsRequestIsActive = computed(() => {
 })
 
 const traceHasActiveCandidate = computed(() => {
-  return rawTimeline.value.some((candidate) => {
-    const status = getDisplayStatus(candidate)
-    return status === 'pending' || status === 'streaming'
-  })
+  return rawTimeline.value.some(isLiveCandidate)
 })
 
 const traceFinalIsTerminal = computed(() => {
@@ -1751,15 +1749,12 @@ watch(groupedTimeline, (newGroups) => {
   }
 
   // 查找正在进行的组
-  const activeIdx = newGroups.findIndex(g => g.primaryStatus === 'pending' || g.primaryStatus === 'streaming')
+  const activeIdx = newGroups.findIndex(g => g.allAttempts.some(isLiveCandidate))
   if (activeIdx >= 0) {
     selectedGroupIndex.value = activeIdx
     // 选中正在进行的尝试，而非最后一个
     const group = newGroups[activeIdx]
-    const attemptIdx = group.allAttempts.findIndex(a => {
-      const status = getDisplayStatus(a)
-      return status === 'pending' || status === 'streaming'
-    })
+    const attemptIdx = group.allAttempts.findIndex(isLiveCandidate)
     selectedAttemptIndex.value = attemptIdx >= 0 ? attemptIdx : group.allAttempts.length - 1
     return
   }
@@ -1853,8 +1848,8 @@ const formatDuration = (startStr: string, endStr: string): string => {
 // 获取状态标签
 const getStatusLabel = (status: string) => {
   const labels: Record<string, string> = {
-    available: '未执行',
-    unused: '未执行',
+    available: '可用未尝试',
+    unused: '未使用',
     pending: '进行中',
     streaming: '传输中',
     stream_interrupted: '流中断',

frontend/src/features/usage/components/__tests__/HorizontalRequestTimeline.spec.ts

@@ -180,7 +180,7 @@ describe('HorizontalRequestTimeline', () => {
     ])
   })
 
-  it('orders visible candidates by scheduling index and hides unstarted lazy candidates', async () => {
+  it('orders visible candidates by scheduling index and includes unattempted candidates', async () => {
     const trace = buildTrace([
       buildCandidate({
         id: 'cand-success',
@@ -244,7 +244,17 @@ describe('HorizontalRequestTimeline', () => {
 
     const labels = [...root.querySelectorAll<HTMLElement>('.node-label')]
       .map(label => label.textContent?.trim())
-    expect(labels).toEqual(['Provider Skipped', 'Provider Failed', 'Provider Success'])
+    expect(labels).toEqual([
+      'Provider Available',
+      'Provider Skipped',
+      'Provider Pending',
+      'Provider Failed',
+      'Provider Success',
+    ])
+
+    const nodeDots = [...root.querySelectorAll<HTMLElement>('.node-dot')]
+    expect(nodeDots[0].classList.contains('status-available')).toBe(true)
+    expect(nodeDots[2].classList.contains('status-pending')).toBe(true)
   })
 
   it('uses candidate terminal status for node colors instead of overriding with HTTP code', async () => {

frontend/src/features/usage/utils/__tests__/poolTrace.spec.ts

@@ -24,7 +24,7 @@ function buildCandidate(
 }
 
 describe('poolTrace', () => {
-  it('keeps only pool nodes that actually participated in scheduling audit fallback', () => {
+  it('keeps pool audit nodes even when they were not attempted', () => {
     const attempts = buildPoolAttemptCandidatesFromAudit([], [
       {
         candidate_index: 0,
@@ -68,11 +68,13 @@ describe('poolTrace', () => {
       },
     ], 'req-1')
 
-    expect(attempts).toHaveLength(2)
+    expect(attempts).toHaveLength(3)
     expect(attempts[0].key_id).toBe('key-success')
     expect(attempts[0].status).toBe('success')
     expect(attempts[1].key_id).toBe('key-skipped')
     expect(attempts[1].status).toBe('skipped')
+    expect(attempts[2].key_id).toBe('key-available')
+    expect(attempts[2].status).toBe('available')
   })
 
   it('preserves real trace attempts even when audit status is non-standard', () => {

frontend/src/features/usage/utils/poolTrace.ts

@@ -12,11 +12,6 @@ export const TIMELINE_STATUS: CandidateRecord['status'][] = [
   'stream_interrupted',
 ]
 
-const POOL_HIDDEN_STATUS = new Set<CandidateRecord['status']>([
-  'available',
-  'unused',
-])
-
 const PROVIDER_TYPE_LIKE_NAMES = new Set<string>([
   'codex',
   'kiro',
@@ -40,9 +35,7 @@ export const makeAttemptKey = (candidateIndex: number, retryIndex: number): stri
 }
 
 export const isPoolParticipatedCandidate = (candidate: CandidateRecord): boolean => {
-  if (POOL_HIDDEN_STATUS.has(candidate.status)) return false
-  if (candidate.status === 'pending' && !candidate.started_at) return false
-  return true
+  return TIMELINE_STATUS.includes(candidate.status)
 }
 
 export const isAttemptedCandidate = (