feat(antigravity): 添加配额窗口显示功能

后端:
- 新增 AntigravityQuotaRefresher 定时刷新配额
- Client 添加 FetchAvailableModels 方法获取模型配额
- 配额数据存入 account.extra.quota 字段

前端:
- AccountUsageCell 支持显示 Antigravity 账户配额
- UsageProgressBar 新增 amber 颜色
- 显示 G3P/G3F/G3I/C4.5 四个配额进度条

frontend/src/components/account/AccountUsageCell.vue

@@ -93,6 +93,48 @@
       <div v-else class="text-xs text-gray-400">-</div>
     </template>
 
+    <!-- Antigravity OAuth accounts: show quota from extra field -->
+    <template v-else-if="account.platform === 'antigravity' && account.type === 'oauth'">
+      <div v-if="hasAntigravityQuota" class="space-y-1">
+        <!-- Gemini 3 Pro -->
+        <UsageProgressBar
+          v-if="antigravity3ProUsage !== null"
+          :label="t('admin.accounts.usageWindow.gemini3Pro')"
+          :utilization="antigravity3ProUsage.utilization"
+          :resets-at="antigravity3ProUsage.resetTime"
+          color="indigo"
+        />
+
+        <!-- Gemini 3 Flash -->
+        <UsageProgressBar
+          v-if="antigravity3FlashUsage !== null"
+          :label="t('admin.accounts.usageWindow.gemini3Flash')"
+          :utilization="antigravity3FlashUsage.utilization"
+          :resets-at="antigravity3FlashUsage.resetTime"
+          color="emerald"
+        />
+
+        <!-- Gemini 3 Image -->
+        <UsageProgressBar
+          v-if="antigravity3ImageUsage !== null"
+          :label="t('admin.accounts.usageWindow.gemini3Image')"
+          :utilization="antigravity3ImageUsage.utilization"
+          :resets-at="antigravity3ImageUsage.resetTime"
+          color="purple"
+        />
+
+        <!-- Claude 4.5 -->
+        <UsageProgressBar
+          v-if="antigravityClaude45Usage !== null"
+          :label="t('admin.accounts.usageWindow.claude45')"
+          :utilization="antigravityClaude45Usage.utilization"
+          :resets-at="antigravityClaude45Usage.resetTime"
+          color="amber"
+        />
+      </div>
+      <div v-else class="text-xs text-gray-400">-</div>
+    </template>
+
     <!-- Other accounts: no usage window -->
     <template v-else>
       <div class="text-xs text-gray-400">-</div>
@@ -273,6 +315,82 @@ const codex7dResetAt = computed(() => {
   return null
 })
 
+// Antigravity quota types
+interface AntigravityModelQuota {
+  remaining: number // 剩余百分比 0-100
+  reset_time: string // ISO 8601 重置时间
+}
+
+interface AntigravityQuotaData {
+  [model: string]: AntigravityModelQuota
+}
+
+interface AntigravityUsageResult {
+  utilization: number
+  resetTime: string | null
+}
+
+// Antigravity quota computed properties
+const hasAntigravityQuota = computed(() => {
+  const extra = props.account.extra as Record<string, unknown> | undefined
+  return extra && typeof extra.quota === 'object' && extra.quota !== null
+})
+
+// 从配额数据中获取使用率（多模型取最低剩余 = 最高使用）
+const getAntigravityUsage = (
+  modelNames: string[]
+): AntigravityUsageResult | null => {
+  const extra = props.account.extra as Record<string, unknown> | undefined
+  if (!extra || typeof extra.quota !== 'object' || extra.quota === null) return null
+
+  const quota = extra.quota as AntigravityQuotaData
+
+  let minRemaining = 100
+  let earliestReset: string | null = null
+
+  for (const model of modelNames) {
+    const modelQuota = quota[model]
+    if (!modelQuota) continue
+
+    if (modelQuota.remaining < minRemaining) {
+      minRemaining = modelQuota.remaining
+    }
+    if (modelQuota.reset_time) {
+      if (!earliestReset || modelQuota.reset_time < earliestReset) {
+        earliestReset = modelQuota.reset_time
+      }
+    }
+  }
+
+  // 如果没有找到任何匹配的模型
+  if (minRemaining === 100 && earliestReset === null) {
+    // 检查是否至少有一个模型有数据
+    const hasAnyData = modelNames.some((m) => quota[m])
+    if (!hasAnyData) return null
+  }
+
+  return {
+    utilization: 100 - minRemaining,
+    resetTime: earliestReset
+  }
+}
+
+// Gemini 3 Pro: gemini-3-pro-low, gemini-3-pro-high, gemini-3-pro-preview
+const antigravity3ProUsage = computed(() =>
+  getAntigravityUsage(['gemini-3-pro-low', 'gemini-3-pro-high', 'gemini-3-pro-preview'])
+)
+
+// Gemini 3 Flash: gemini-3-flash
+const antigravity3FlashUsage = computed(() => getAntigravityUsage(['gemini-3-flash']))
+
+// Gemini 3 Image: gemini-3-pro-image
+const antigravity3ImageUsage = computed(() => getAntigravityUsage(['gemini-3-pro-image']))
+
+// Claude 4.5: claude-sonnet-4-5, claude-opus-4-5-thinking
+const antigravityClaude45Usage = computed(() =>
+  getAntigravityUsage(['claude-sonnet-4-5', 'claude-opus-4-5-thinking'])
+)
+
 const loadUsage = async () => {
   // Fetch usage for Anthropic OAuth and Setup Token accounts
   // OpenAI usage comes from account.extra field (updated during forwarding)

frontend/src/components/account/UsageProgressBar.vue

@@ -58,7 +58,7 @@ const props = defineProps<{
   label: string
   utilization: number // Percentage (0-100+)
   resetsAt?: string | null
-  color: 'indigo' | 'emerald' | 'purple'
+  color: 'indigo' | 'emerald' | 'purple' | 'amber'
   windowStats?: WindowStats | null
 }>()
 
@@ -69,7 +69,8 @@ const labelClass = computed(() => {
   const colors = {
     indigo: 'bg-indigo-100 text-indigo-700 dark:bg-indigo-900/40 dark:text-indigo-300',
     emerald: 'bg-emerald-100 text-emerald-700 dark:bg-emerald-900/40 dark:text-emerald-300',
-    purple: 'bg-purple-100 text-purple-700 dark:bg-purple-900/40 dark:text-purple-300'
+    purple: 'bg-purple-100 text-purple-700 dark:bg-purple-900/40 dark:text-purple-300',
+    amber: 'bg-amber-100 text-amber-700 dark:bg-amber-900/40 dark:text-amber-300'
   }
   return colors[props.color]
 })

frontend/src/i18n/locales/en.ts

@@ -1157,7 +1157,11 @@ export default {
         noData: 'No usage data available for this account'
       },
       usageWindow: {
-        statsTitle: '5-Hour Window Usage Statistics'
+        statsTitle: '5-Hour Window Usage Statistics',
+        gemini3Pro: 'G3P',
+        gemini3Flash: 'G3F',
+        gemini3Image: 'G3I',
+        claude45: 'C4.5'
       }
     },
 

frontend/src/i18n/locales/zh.ts

@@ -966,7 +966,11 @@ export default {
         cooldown: '冷却中'
       },
       usageWindow: {
-        statsTitle: '5小时窗口用量统计'
+        statsTitle: '5小时窗口用量统计',
+        gemini3Pro: 'G3P',
+        gemini3Flash: 'G3F',
+        gemini3Image: 'G3I',
+        claude45: 'C4.5'
       },
       form: {
         nameLabel: '账号名称',