fix: SuperGrokPro 用 4.5 窗口区分 Heavy，容量抖动只封单模型

JWT 的 SuperGrokPro 同时覆盖 SuperGrok 与 Heavy，账单月额度又滞后，
账号会误升/误降。multi-agent 容量抖动还会把整号提出调度。

- CanonicalGrokPlan：明确 JWT 优先；模糊档仅采新鲜的 grok-4.5 Responses 窗口
- 配额快照写入 plan_from_45_responses 时间戳，过期信号不用
- engine_overloaded 对 multi-agent 只封当前模型 0.5s–5min

frontend/src/views/admin/AccountsView.vue

@@ -1481,15 +1481,79 @@ const { pause: pauseAutoRefresh, resume: resumeAutoRefresh } = useIntervalFn(
   { immediate: false }
 )
 
-// Persisted credentials.subscription_tier outranks lagging billing/quota snapshots.
+const GROK_QUOTA_SIGNAL_MAX_AGE_MS = 24 * 60 * 60 * 1000
+const GROK_QUOTA_SIGNAL_MAX_FUTURE_SKEW_MS = 5 * 60 * 1000
+
+function normalizeGrokPlanKey(value: unknown): string {
+  return String(value ?? '')
+    .trim()
+    .toLowerCase()
+    .replace(/[\s_-]+/g, '')
+}
+
+function isGrokQuotaTimestampFresh(raw: unknown): boolean {
+  const value = String(raw || '').trim()
+  if (!value) return false
+  const observedAt = Date.parse(value)
+  if (!Number.isFinite(observedAt)) return false
+  const age = Date.now() - observedAt
+  return age <= GROK_QUOTA_SIGNAL_MAX_AGE_MS && age >= -GROK_QUOTA_SIGNAL_MAX_FUTURE_SKEW_MS
+}
+
+function isGrok45ResponsesQuotaModel(model: unknown): boolean {
+  const value = String(model || '')
+    .trim()
+    .toLowerCase()
+    .replace(/^(x-ai|xai)\//, '')
+  return value === 'grok-4.5' || value.startsWith('grok-4.5-')
+}
+
+function grokQuotaLooksHeavy(snapshot: Record<string, any> | undefined): boolean {
+  const req = Number(snapshot?.requests?.limit ?? 0)
+  const tok = Number(snapshot?.tokens?.limit ?? 0)
+  return req >= 8300 || tok >= 53_000_000
+}
+
+function grok45ResponsesPlanIsHeavy(snapshot: Record<string, any> | undefined): boolean {
+  if (!snapshot) return false
+  const hint = normalizeGrokPlanKey(snapshot.plan_from_45_responses)
+  if (hint === 'supergrokheavy' && isGrokQuotaTimestampFresh(snapshot.plan_from_45_responses_at)) {
+    return true
+  }
+  const observedAt = snapshot.last_headers_seen_at || snapshot.updated_at
+  return (
+    isGrok45ResponsesQuotaModel(snapshot.model) &&
+    isGrokQuotaTimestampFresh(observedAt) &&
+    grokQuotaLooksHeavy(snapshot)
+  )
+}
+
+// JWT / unambiguous credentials outrank snapshots. SuperGrokPro is ambiguous
+// (covers SuperGrok and Heavy). 8300/53M only upgrades when the window came
+// from grok-4.5 Responses (or a carried 4.5 hint).
 function getAccountPlanType(row: any): string | undefined {
   if (!row) return undefined
   if (row.platform === 'grok') {
     const extra = (row.extra || {}) as Record<string, any>
     const billing = extra.grok_billing_snapshot as Record<string, any> | undefined
-    const quota = extra.grok_quota_snapshot as Record<string, any> | undefined
+    const quota = (extra.grok_quota_snapshot || extra.grok_usage_snapshot) as Record<string, any> | undefined
+    const cred = row.credentials?.subscription_tier
+    const credKey = normalizeGrokPlanKey(cred)
+    if (credKey && credKey !== 'supergrokpro') {
+      return cred
+    }
+    if (
+      grok45ResponsesPlanIsHeavy(quota) &&
+      (credKey === 'supergrokpro' ||
+        normalizeGrokPlanKey(billing?.plan) === 'supergrok' ||
+        normalizeGrokPlanKey(billing?.plan) === 'supergrokpro')
+    ) {
+      return 'SuperGrok Heavy'
+    }
+    if (credKey === 'supergrokpro') {
+      return billing?.plan || 'SuperGrok'
+    }
     return (
-      row.credentials?.subscription_tier ||
       billing?.plan ||
       quota?.subscription_tier ||
       extra.subscription_tier ||

frontend/src/views/admin/__tests__/AccountsView.sparkShadow.spec.ts

@@ -396,6 +396,38 @@ describe('admin AccountsView — 账号行展示', () => {
         type: 'oauth',
         credentials: { plan_type: 'SuperGrok' },
       },
+      {
+        id: 206,
+        name: 'supergrokpro-responses-quota',
+        platform: 'grok',
+        type: 'oauth',
+        credentials: { subscription_tier: 'SuperGrokPro' },
+        extra: {
+          grok_billing_snapshot: { plan: 'SuperGrok' },
+          grok_quota_snapshot: {
+            model: 'grok-4.5',
+            last_headers_seen_at: new Date().toISOString(),
+            requests: { limit: 8300 },
+            tokens: { limit: 53_000_000 },
+          },
+        },
+      },
+      {
+        id: 207,
+        name: 'supergrokpro-other-model-quota',
+        platform: 'grok',
+        type: 'oauth',
+        credentials: { subscription_tier: 'SuperGrokPro' },
+        extra: {
+          grok_billing_snapshot: { plan: 'SuperGrok' },
+          grok_quota_snapshot: {
+            model: 'grok-4.6',
+            last_headers_seen_at: new Date().toISOString(),
+            requests: { limit: 8300 },
+            tokens: { limit: 53_000_000 },
+          },
+        },
+      },
     ]
 
     listAccounts.mockResolvedValue({
@@ -416,6 +448,8 @@ describe('admin AccountsView — 账号行展示', () => {
       'FREE',
       'BASIC',
       'SuperGrok',
+      'SuperGrok Heavy',
+      'SuperGrok',
     ])
 
     wrapper.unmount()