fix(push-config): 移除平台切换开关和服务状态，修复凭据保存不生效问题

- 删除"配置平台"切换 UI（Android/iOS/鸿蒙分段选择器）和推送服务开关
- 删除"服务状态"显示（页面可达即已开通，显示"未开通"逻辑有误）
- 修复厂商凭据保存：前端直接将 PushServiceConfig 作为 body，
  服务端 FeatureServiceConfigRequest 期望 pushConfig 字段包裹，
  导致 req.pushConfig() 始终为 null，vendors 从未实际写入。
  改为发送 { pushConfig: payload } 使服务端正确解析。
- loadData 改为优先选取已启用的 PUSH 服务平台

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

tenant-platform/src/views/push/PushConfigView.vue

@@ -10,17 +10,7 @@
           <el-text class="mono">{{ app.appKey }}</el-text>
           <el-button link @click="copy(app.appKey)"><el-icon><CopyDocument /></el-icon></el-button>
         </el-descriptions-item>
-        <el-descriptions-item label="服务状态">
-          <el-tag :type="pushEnabled ? 'success' : 'info'">{{ pushEnabled ? '已开通' : '未开通' }}</el-tag>
-        </el-descriptions-item>
-        <el-descriptions-item label="配置平台">
-          <el-segmented v-model="selectedPlatform" :options="platformOptions" @change="applySelectedPlatformConfig" />
-        </el-descriptions-item>
       </el-descriptions>
-      <div class="push-switch-row">
-        <el-switch :model-value="pushEnabled" @change="(val: boolean) => onTogglePushService(val)" />
-        <span class="hint">关闭后，推送注册与推送发送都不会再向该应用开放。</span>
-      </div>
     </el-card>
 
     <el-alert
@@ -199,10 +189,10 @@
 </template>
 
 <script setup lang="ts">
-import { computed, onBeforeUnmount, onMounted, reactive, ref } from 'vue'
+import { onBeforeUnmount, onMounted, reactive, ref } from 'vue'
 import { useRoute } from 'vue-router'
 import { CopyDocument } from '@element-plus/icons-vue'
-import { ElMessage, ElMessageBox } from 'element-plus'
+import { ElMessage } from 'element-plus'
 import {
   appApi,
   type App,
@@ -262,12 +252,6 @@ const saving = ref(false)
 const isMobile = ref(window.innerWidth < 768)
 const selectedPlatform = ref<'ANDROID' | 'IOS' | 'HARMONY'>('ANDROID')
 
-const platformOptions = [
-  { label: 'Android', value: 'ANDROID' },
-  { label: 'iOS', value: 'IOS' },
-  { label: '鸿蒙', value: 'HARMONY' },
-]
-
 const vendorOptions: Array<{ label: string; value: PushVendorKey }> = [
   { label: '华为', value: 'huawei' },
   { label: '小米', value: 'xiaomi' },
@@ -389,10 +373,6 @@ const vendorDefs: VendorDef[] = [
   },
 ]
 
-const pushEnabled = computed(() => services.value.some(
-  s => s.serviceType === 'PUSH' && s.platform === selectedPlatform.value && s.enabled,
-))
-
 function updateViewport() {
   isMobile.value = window.innerWidth < 768
 }
@@ -516,9 +496,10 @@ async function loadData() {
     ])
     app.value = appRes.data.data
     services.value = svcRes.data.data
-    const firstPushService = services.value.find(s => s.serviceType === 'PUSH')
-    if (firstPushService && !services.value.some(s => s.serviceType === 'PUSH' && s.platform === selectedPlatform.value)) {
-      selectedPlatform.value = firstPushService.platform
+    const activePushService = services.value.find(s => s.serviceType === 'PUSH' && s.enabled)
+      ?? services.value.find(s => s.serviceType === 'PUSH')
+    if (activePushService) {
+      selectedPlatform.value = activePushService.platform as 'ANDROID' | 'IOS' | 'HARMONY'
     }
     applySelectedPlatformConfig()
   } finally {
@@ -551,7 +532,7 @@ async function saveConfig() {
       },
       profiles: pushConfig.profiles.map(profile => normalizeProfile(profile)),
     }
-    await appApi.updateServiceConfig(app.value.appKey, selectedPlatform.value, 'PUSH', payload)
+    await appApi.updateServiceConfig(app.value.appKey, selectedPlatform.value, 'PUSH', { pushConfig: payload })
     ElMessage.success('推送配置已保存')
     await loadData()
   } catch {
@@ -569,22 +550,6 @@ function removeProfile(index: number) {
   pushConfig.profiles.splice(index, 1)
 }
 
-async function onTogglePushService(enable: boolean) {
-  if (enable) {
-    ElMessage.info('请通过服务开通流程启用推送服务')
-    return
-  }
-  await ElMessageBox.confirm('确认关闭离线推送服务？', '关闭服务', {
-    type: 'warning',
-    confirmButtonText: '确认关闭',
-    cancelButtonText: '取消',
-  })
-  if (!app.value) return
-  await appApi.toggleService(app.value.appKey, selectedPlatform.value, 'PUSH', false)
-  ElMessage.success('已关闭')
-  await loadData()
-}
-
 function reloadConfig() {
   return loadData()
 }
@@ -614,14 +579,6 @@ onBeforeUnmount(() => window.removeEventListener('resize', updateViewport))
   overflow-x: auto;
 }
 
-.push-switch-row {
-  margin-top: 12px;
-  display: flex;
-  gap: 8px;
-  flex-wrap: wrap;
-  align-items: center;
-}
-
 .vendor-grid {
   display: grid;
   grid-template-columns: repeat(auto-fill, minmax(320px, 1fr));
@@ -671,11 +628,6 @@ onBeforeUnmount(() => window.removeEventListener('resize', updateViewport))
     grid-template-columns: 1fr;
   }
 
-  .push-switch-row {
-    flex-direction: column;
-    align-items: flex-start;
-  }
-
   .toolbar :deep(.el-button),
   .profiles-actions :deep(.el-button) {
     width: 100%;