fix(membership): 开通会员页改用 getMembershipPlans 获取实际配置价格

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

cfc-frontend/pages/membership/upgrade.vue

@@ -184,7 +184,7 @@
 </template>
 
 <script>
-import { getMyMembership, getMembershipLevels, getUpgradeRecords, upgradeMember, createOrder, getCouponList, requestVirtualPayment } from '../../utils/api.js'
+import { getMyMembership, getMembershipPlans, getUpgradeRecords, upgradeMember, createOrder, getCouponList, requestVirtualPayment } from '../../utils/api.js'
 
 export default {
   data() {
@@ -258,7 +258,7 @@ export default {
         console.error('加载会员信息失败', e)
       }
       try {
-        const levelsRes = await getMembershipLevels()
+        const levelsRes = await getMembershipPlans()
         this.levels = levelsRes.data || []
       } catch (e) {
         console.error('加载会员等级失败', e)