feat(antigravity): comprehensive enhancements - model mapping, rate limiting, scheduling & ops

Key changes:
- Upgrade model mapping: Opus 4.5 → Opus 4.6-thinking with precise matching
- Unified rate limiting: scope-level → model-level with Redis snapshot sync
- Load-balanced scheduling by call count with smart retry mechanism
- Force cache billing support
- Model identity injection in prompts with leak prevention
- Thinking mode auto-handling (max_tokens/budget_tokens fix)
- Frontend: whitelist mode toggle, model mapping validation, status indicators
- Gemini session fallback with Redis Trie O(L) matching
- Ops: enhanced concurrency monitoring, account availability, retry logic
- Migration scripts: 049-051 for model mapping unification

frontend/src/views/admin/ProxiesView.vue

@@ -2,10 +2,50 @@
   <AppLayout>
     <TablePageLayout>
       <template #filters>
-        <div class="flex flex-col gap-3 lg:flex-row lg:items-center lg:justify-between">
-          <!-- Search + Filters -->
-          <div class="flex flex-wrap items-center gap-2">
-            <div class="relative min-w-0 flex-1 lg:w-48 lg:flex-none">
+        <div class="space-y-3">
+          <!-- Row 1: Actions -->
+          <div class="flex flex-wrap items-center gap-3">
+            <button
+              @click="loadProxies"
+              :disabled="loading"
+              class="btn btn-secondary"
+              :title="t('common.refresh')"
+            >
+              <Icon name="refresh" size="md" :class="loading ? 'animate-spin' : ''" />
+            </button>
+            <button
+              @click="handleBatchTest"
+              :disabled="batchTesting || loading"
+              class="btn btn-secondary"
+              :title="t('admin.proxies.testConnection')"
+            >
+              <Icon name="play" size="md" class="mr-2" />
+              {{ t('admin.proxies.testConnection') }}
+            </button>
+            <button
+              @click="openBatchDelete"
+              :disabled="selectedCount === 0"
+              class="btn btn-danger"
+              :title="t('admin.proxies.batchDeleteAction')"
+            >
+              <Icon name="trash" size="md" class="mr-2" />
+              {{ t('admin.proxies.batchDeleteAction') }}
+            </button>
+            <button @click="showImportData = true" class="btn btn-secondary">
+              {{ t('admin.proxies.dataImport') }}
+            </button>
+            <button @click="showExportDataDialog = true" class="btn btn-secondary">
+              {{ selectedCount > 0 ? t('admin.proxies.dataExportSelected') : t('admin.proxies.dataExport') }}
+            </button>
+            <button @click="showCreateModal = true" class="btn btn-primary">
+              <Icon name="plus" size="md" class="mr-2" />
+              {{ t('admin.proxies.createProxy') }}
+            </button>
+          </div>
+
+          <!-- Row 2: Search + Filters -->
+          <div class="flex flex-wrap items-center gap-3">
+            <div class="relative w-full sm:w-64">
               <Icon
                 name="search"
                 size="md"
@@ -20,7 +60,7 @@
               />
             </div>
 
-            <div class="w-28 lg:w-36">
+            <div class="w-full sm:w-40">
               <Select
                 v-model="filters.protocol"
                 :options="protocolOptions"
@@ -28,7 +68,7 @@
                 @change="loadProxies"
               />
             </div>
-            <div class="w-24 lg:w-32">
+            <div class="w-full sm:w-36">
               <Select
                 v-model="filters.status"
                 :options="statusOptions"
@@ -37,48 +77,6 @@
               />
             </div>
           </div>
-
-          <!-- Actions -->
-          <div class="flex flex-wrap items-center gap-2">
-            <button
-              @click="loadProxies"
-              :disabled="loading"
-              class="btn btn-secondary btn-sm lg:btn-md"
-              :title="t('common.refresh')"
-            >
-              <Icon name="refresh" size="md" :class="loading ? 'animate-spin' : ''" />
-            </button>
-            <button
-              @click="handleBatchTest"
-              :disabled="batchTesting || loading"
-              class="btn btn-secondary btn-sm lg:btn-md"
-              :title="t('admin.proxies.testConnection')"
-            >
-              <Icon name="play" size="md" class="lg:mr-2" />
-              <span class="hidden lg:inline">{{ t('admin.proxies.testConnection') }}</span>
-            </button>
-            <button
-              @click="openBatchDelete"
-              :disabled="selectedCount === 0"
-              class="btn btn-danger btn-sm lg:btn-md"
-              :title="t('admin.proxies.batchDeleteAction')"
-            >
-              <Icon name="trash" size="md" class="lg:mr-2" />
-              <span class="hidden lg:inline">{{ t('admin.proxies.batchDeleteAction') }}</span>
-            </button>
-            <button @click="showImportData = true" class="btn btn-secondary btn-sm lg:btn-md">
-              <span class="lg:hidden">{{ t('admin.proxies.dataImportShort') }}</span>
-              <span class="hidden lg:inline">{{ t('admin.proxies.dataImport') }}</span>
-            </button>
-            <button @click="showExportDataDialog = true" class="btn btn-secondary btn-sm lg:btn-md">
-              <span class="lg:hidden">{{ t('admin.proxies.dataExportShort') }}</span>
-              <span class="hidden lg:inline">{{ selectedCount > 0 ? t('admin.proxies.dataExportSelected') : t('admin.proxies.dataExport') }}</span>
-            </button>
-            <button @click="showCreateModal = true" class="btn btn-primary btn-sm lg:btn-md">
-              <Icon name="plus" size="md" class="lg:mr-2" />
-              <span class="hidden lg:inline">{{ t('admin.proxies.createProxy') }}</span>
-            </button>
-          </div>
         </div>
       </template>