refactor(frontend): 统一 routing 数据加载，消除子组件重复请求

将 Model 和 Provider 详情抽屉中的 routing/mapping 数据加载逻辑
从各子组件（RoutingTab、ModelMappingsTab、ModelsTab、ModelMappingTab）
提升到父组件统一管理，通过 props 向下传递数据，避免多个子组件独立发起相同的 API 请求，提升页面加载性能。

frontend/src/features/providers/components/ProviderDetailDrawer.vue

@@ -876,8 +876,11 @@
                 :key="`models-${provider.id}`"
                 :provider="provider"
                 :endpoints="endpoints"
+                :models="providerModels"
+                :mapping-preview="providerMappingPreview"
                 @edit-model="handleEditModel"
                 @batch-assign="handleBatchAssign"
+                @refresh="loadEndpoints"
               />
 
               <!-- 模型映射 -->
@@ -887,6 +890,9 @@
                 :key="`mapping-${provider.id}`"
                 :provider="provider"
                 :provider-keys="providerKeys"
+                :models="providerModels"
+                :mapping-preview="providerMappingPreview"
+                :endpoints="endpoints"
                 @refresh="handleModelMappingChanged"
               />
             </div>
@@ -1027,7 +1033,14 @@ import { useToast } from '@/composables/useToast'
 import { useConfirm } from '@/composables/useConfirm'
 import { useClipboard } from '@/composables/useClipboard'
 import { useCountdownTimer, formatCountdown, getOAuthExpiresCountdown } from '@/composables/useCountdownTimer'
-import { getProvider, getProviderEndpoints, updateProvider } from '@/api/endpoints'
+import {
+  getProvider,
+  getProviderEndpoints,
+  updateProvider,
+  getProviderModels,
+  getProviderMappingPreview,
+  type ProviderMappingPreviewResponse
+} from '@/api/endpoints'
 import { adminApi } from '@/api/admin'
 import {
   KeyFormDialog,
@@ -1092,6 +1105,8 @@ const loading = ref(false)
 const provider = ref<any>(null)
 const endpoints = ref<ProviderEndpointWithKeys[]>([])
 const providerKeys = ref<EndpointAPIKey[]>([])  // Provider 级别的 keys
+const providerModels = ref<Model[]>([])  // Provider 级别的 models
+const providerMappingPreview = ref<ProviderMappingPreviewResponse | null>(null)  // 映射预览
 
 // 系统级格式转换配置
 const systemFormatConversionEnabled = ref(false)
@@ -2539,13 +2554,17 @@ async function loadEndpoints() {
   if (!props.providerId) return
 
   try {
-    // 并行加载端点列表和 Provider 级别的 keys
-    const [endpointsList, providerKeysResult] = await Promise.all([
+    // 并行加载端点列表、Provider 级别的 keys、models 和映射预览
+    const [endpointsList, providerKeysResult, modelsResult, mappingPreviewResult] = await Promise.all([
       getProviderEndpoints(props.providerId),
       getProviderKeys(props.providerId).catch(() => []),
+      getProviderModels(props.providerId).catch(() => []),
+      getProviderMappingPreview(props.providerId).catch(() => null),
     ])
 
     providerKeys.value = providerKeysResult
+    providerModels.value = modelsResult
+    providerMappingPreview.value = mappingPreviewResult
     // 按 API 格式排序
     endpoints.value = endpointsList.sort((a, b) => {
       const aIdx = API_FORMAT_ORDER.indexOf(a.api_format)