refactor: replace scope-level rate limiting with model-level rate limiting

Merge functional changes from develop branch:
- Remove AntigravityQuotaScope system (claude/gemini_text/gemini_image)
- Replace with per-model rate limiting using resolveAntigravityModelKey
- Remove model load statistics (IncrModelCallCount/GetModelLoadBatch)
- Simplify account selection to unified priority→load→LRU algorithm
- Remove SetAntigravityQuotaScopeLimit from AccountRepository
- Clean up scope-related UI indicators and API fields

frontend/src/api/admin/ops.ts

@@ -376,7 +376,6 @@ export interface PlatformAvailability {
   total_accounts: number
   available_count: number
   rate_limit_count: number
-  scope_rate_limit_count?: Record<string, number>
   error_count: number
 }
 
@@ -387,7 +386,6 @@ export interface GroupAvailability {
   total_accounts: number
   available_count: number
   rate_limit_count: number
-  scope_rate_limit_count?: Record<string, number>
   error_count: number
 }
 
@@ -402,7 +400,6 @@ export interface AccountAvailability {
   is_rate_limited: boolean
   rate_limit_reset_at?: string
   rate_limit_remaining_sec?: number
-  scope_rate_limits?: Record<string, number>
   is_overloaded: boolean
   overload_until?: string
   overload_remaining_sec?: number

frontend/src/components/account/AccountStatusIndicator.vue

@@ -76,26 +76,6 @@
       </div>
     </div>
 
-    <!-- Scope Rate Limit Indicators (Antigravity) -->
-    <template v-if="activeScopeRateLimits.length > 0">
-      <div v-for="item in activeScopeRateLimits" :key="item.scope" class="group relative">
-        <span
-          class="inline-flex items-center gap-1 rounded bg-orange-100 px-1.5 py-0.5 text-xs font-medium text-orange-700 dark:bg-orange-900/30 dark:text-orange-400"
-        >
-          <Icon name="exclamationTriangle" size="xs" :stroke-width="2" />
-          {{ formatScopeName(item.scope) }}
-        </span>
-        <!-- Tooltip -->
-        <div
-          class="pointer-events-none absolute bottom-full left-1/2 z-50 mb-2 -translate-x-1/2 whitespace-nowrap rounded bg-gray-900 px-2 py-1 text-xs text-white opacity-0 transition-opacity group-hover:opacity-100 dark:bg-gray-700"
-        >
-          {{ t('admin.accounts.status.scopeRateLimitedUntil', { scope: formatScopeName(item.scope), time: formatTime(item.reset_at) }) }}
-          <div
-            class="absolute left-1/2 top-full -translate-x-1/2 border-4 border-transparent border-t-gray-900 dark:border-t-gray-700"          ></div>
-        </div>
-      </div>
-    </template>
-
     <!-- Model Rate Limit Indicators (Antigravity OAuth Smart Retry) -->
     <template v-if="activeModelRateLimits.length > 0">
       <div v-for="item in activeModelRateLimits" :key="item.model" class="group relative">
@@ -160,15 +140,6 @@ const isRateLimited = computed(() => {
   return new Date(props.account.rate_limit_reset_at) > new Date()
 })
 
-// Computed: active scope rate limits (Antigravity)
-const activeScopeRateLimits = computed(() => {
-  const scopeLimits = props.account.scope_rate_limits
-  if (!scopeLimits) return []
-  const now = new Date()
-  return Object.entries(scopeLimits)
-    .filter(([, info]) => new Date(info.reset_at) > now)
-    .map(([scope, info]) => ({ scope, reset_at: info.reset_at }))
-})
 
 // Computed: active model rate limits (Antigravity OAuth Smart Retry)
 const activeModelRateLimits = computed(() => {

frontend/src/i18n/locales/en.ts

@@ -1360,7 +1360,6 @@ export default {
         overloaded: 'Overloaded',
         tempUnschedulable: 'Temp Unschedulable',
         rateLimitedUntil: 'Rate limited until {time}',
-        scopeRateLimitedUntil: '{scope} rate limited until {time}',
         modelRateLimitedUntil: '{model} rate limited until {time}',
         overloadedUntil: 'Overloaded until {time}',
         viewTempUnschedDetails: 'View temp unschedulable details'
@@ -3063,7 +3062,6 @@ export default {
         empty: 'No data',
         queued: 'Queue {count}',
         rateLimited: 'Rate-limited {count}',
-        scopeRateLimitedTooltip: '{scope} rate-limited ({count} accounts)',
         errorAccounts: 'Errors {count}',
         loadFailed: 'Failed to load concurrency data'
       },

frontend/src/i18n/locales/zh.ts

@@ -1496,7 +1496,6 @@ export default {
         overloaded: '过载中',
         tempUnschedulable: '临时不可调度',
         rateLimitedUntil: '限流中，重置时间：{time}',
-        scopeRateLimitedUntil: '{scope} 限流中，重置时间：{time}',
         modelRateLimitedUntil: '{model} 限流至 {time}',
         overloadedUntil: '负载过重，重置时间：{time}',
         viewTempUnschedDetails: '查看临时不可调度详情'
@@ -3236,7 +3235,6 @@ export default {
         empty: '暂无数据',
         queued: '队列 {count}',
         rateLimited: '限流 {count}',
-        scopeRateLimitedTooltip: '{scope} 限流中 ({count} 个账号)',
         errorAccounts: '异常 {count}',
         loadFailed: '加载并发数据失败'
       },

frontend/src/types/index.ts

@@ -594,9 +594,6 @@ export interface Account {
   temp_unschedulable_until: string | null
   temp_unschedulable_reason: string | null
 
-  // Antigravity scope 级限流状态
-  scope_rate_limits?: Record<string, { reset_at: string; remaining_sec: number }>
-
   // Session window fields (5-hour window)
   session_window_start: string | null
   session_window_end: string | null

frontend/src/views/admin/ops/components/OpsConcurrencyCard.vue

@@ -56,7 +56,6 @@ interface SummaryRow {
   total_accounts: number
   available_accounts: number
   rate_limited_accounts: number
-  scope_rate_limit_count?: Record<string, number>
   error_accounts: number
   // 并发统计
   total_concurrency: number
@@ -122,7 +121,7 @@ const platformRows = computed((): SummaryRow[] => {
       total_accounts: totalAccounts,
       available_accounts: availableAccounts,
       rate_limited_accounts: safeNumber(avail.rate_limit_count),
-      scope_rate_limit_count: avail.scope_rate_limit_count,
+
       error_accounts: safeNumber(avail.error_count),
       total_concurrency: totalConcurrency,
       used_concurrency: usedConcurrency,
@@ -162,7 +161,7 @@ const groupRows = computed((): SummaryRow[] => {
         total_accounts: totalAccounts,
         available_accounts: availableAccounts,
         rate_limited_accounts: safeNumber(avail.rate_limit_count),
-        scope_rate_limit_count: avail.scope_rate_limit_count,
+  
         error_accounts: safeNumber(avail.error_count),
         total_concurrency: totalConcurrency,
         used_concurrency: usedConcurrency,
@@ -329,14 +328,6 @@ function formatDuration(seconds: number): string {
   return `${hours}h`
 }
 
-function formatScopeName(scope: string): string {
-  const names: Record<string, string> = {
-    claude: 'Claude',
-    gemini_text: 'Gemini',
-    gemini_image: 'Image'
-  }
-  return names[scope] || scope
-}
 
 watch(
   () => realtimeEnabled.value,
@@ -505,18 +496,6 @@ watch(
               {{ t('admin.ops.concurrency.rateLimited', { count: row.rate_limited_accounts }) }}
             </span>
 
-            <!-- Scope 限流 (仅 Antigravity) -->
-            <template v-if="row.scope_rate_limit_count && Object.keys(row.scope_rate_limit_count).length > 0">
-              <span
-                v-for="(count, scope) in row.scope_rate_limit_count"
-                :key="scope"
-                class="rounded-full bg-orange-100 px-1.5 py-0.5 font-semibold text-orange-700 dark:bg-orange-900/30 dark:text-orange-400"
-                :title="t('admin.ops.concurrency.scopeRateLimitedTooltip', { scope, count })"
-              >
-                {{ formatScopeName(scope as string) }} {{ count }}
-              </span>
-            </template>
-
             <!-- 异常账号 -->
             <span
               v-if="row.error_accounts > 0"