feat(anthropic): treat 7d_oi (Fable) window 429 as model-level rate limit

Anthropic OAuth/setup-token accounts now expose a Fable-only 7d window in
429 responses (anthropic-ratelimit-unified-7d_oi-*). Previously, a 429
triggered solely by this window fell through to the legacy path and marked
the whole account rate limited (picking the sooner 5h/7d reset) even though
5h/7d were still "allowed".

Backend:
- HandleUpstreamError: when only 7d_oi is rejected/exceeded, set a
  model-level rate limit (scope "claude-fable-5") and skip account-level
  SetRateLimited / session-window rewrite / temp-unsched entirely.
  Real 5h/7d exhaustion keeps the exact legacy account-level behavior.
- modelRateLimitKeysForRequest: append the Fable family scope for any
  mapped Anthropic model containing "fable", so claude-fable-5[1m] and
  other variants are excluded from scheduling together.
- Passive sampling: collect 7d_oi utilization/reset into Extra
  (passive_usage_7d_oi_*), including from the 429 response itself so the
  usage bar doesn't freeze at a stale value during the limit window;
  cleared on 5h window reset like the existing 7d keys.
- Usage API: new seven_day_fable window in UsageInfo. GetPassiveUsage
  builds it from passive samples; active queries parse the upstream
  seven_day_overage_included field (claim name from the
  representative-claim header) and fall back to passive data when the
  upstream usage API doesn't return it, so the active-query button keeps
  the bar populated. seven_day_sonnet handling is preserved unchanged.

Frontend:
- /admin/accounts usage cell renders a "7d F" (amber) progress bar next to
  the existing 5h / 7d / 7d S bars for Anthropic OAuth/setup-token accounts.

frontend/src/components/account/AccountUsageCell.vue

@@ -68,6 +68,15 @@
           color="purple"
         />
 
+        <!-- 7d Fable Window (7d_oi) -->
+        <UsageProgressBar
+          v-if="usageInfo.seven_day_fable"
+          label="7d F"
+          :utilization="usageInfo.seven_day_fable.utilization"
+          :resets-at="usageInfo.seven_day_fable.resets_at"
+          color="amber"
+        />
+
         <!-- Passive sampling label + active query button -->
         <div class="flex items-center gap-1.5 mt-0.5">
           <span

frontend/src/components/account/__tests__/AccountUsageCell.spec.ts

@@ -655,4 +655,102 @@ describe('AccountUsageCell', () => {
 		expect(wrapper.text()).toContain('A $0.00')
 		expect(wrapper.text()).toContain('U $0.00')
   })
+
+  it('Anthropic OAuth 会渲染 7d F (Fable) 进度条，且 7d S 逻辑保留', async () => {
+    getUsage.mockResolvedValue({
+      source: 'passive',
+      five_hour: {
+        utilization: 41,
+        resets_at: '2026-07-03T10:00:00Z',
+        remaining_seconds: 3600
+      },
+      seven_day: {
+        utilization: 56,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      },
+      seven_day_sonnet: {
+        utilization: 30,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      },
+      seven_day_fable: {
+        utilization: 100,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({
+          id: 3001,
+          platform: 'anthropic',
+          type: 'oauth',
+          extra: {}
+        })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'utilization', 'resetsAt', 'color'],
+            template: '<div class="usage-bar">{{ label }}|{{ utilization }}</div>'
+          },
+          AccountQuotaInfo: true,
+          GrokQuotaProbeCell: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('5h|41')
+    expect(wrapper.text()).toContain('7d|56')
+    expect(wrapper.text()).toContain('7d S|30')
+    expect(wrapper.text()).toContain('7d F|100')
+  })
+
+  it('Anthropic OAuth 无 Fable 数据时不渲染 7d F 进度条', async () => {
+    getUsage.mockResolvedValue({
+      source: 'passive',
+      five_hour: {
+        utilization: 41,
+        resets_at: '2026-07-03T10:00:00Z',
+        remaining_seconds: 3600
+      },
+      seven_day: {
+        utilization: 56,
+        resets_at: '2026-07-06T22:00:00Z',
+        remaining_seconds: 300000
+      }
+    })
+
+    const wrapper = mount(AccountUsageCell, {
+      props: {
+        account: makeAccount({
+          id: 3002,
+          platform: 'anthropic',
+          type: 'oauth',
+          extra: {}
+        })
+      },
+      global: {
+        stubs: {
+          UsageProgressBar: {
+            props: ['label', 'utilization', 'resetsAt', 'color'],
+            template: '<div class="usage-bar">{{ label }}|{{ utilization }}</div>'
+          },
+          AccountQuotaInfo: true,
+          GrokQuotaProbeCell: true
+        }
+      }
+    })
+
+    await flushPromises()
+
+    expect(wrapper.text()).toContain('5h|41')
+    expect(wrapper.text()).toContain('7d|56')
+    expect(wrapper.text()).not.toContain('7d S')
+    expect(wrapper.text()).not.toContain('7d F')
+  })
 })

frontend/src/types/index.ts

@@ -984,6 +984,7 @@ export interface AccountUsageInfo {
   five_hour: UsageProgress | null
   seven_day: UsageProgress | null
   seven_day_sonnet: UsageProgress | null
+  seven_day_fable?: UsageProgress | null
   gemini_shared_daily?: UsageProgress | null
   gemini_pro_daily?: UsageProgress | null
   gemini_flash_daily?: UsageProgress | null