feat(toast): 实现原生Toast系统并优化会员购买错误处理

- 新增iOS原生Toast模块(NativeToastManager)，提供毛玻璃风格的Toast展示
- 重构ToastContext为原生模块调用，添加错误边界和回退机制
- 优化会员购买流程的错误处理，使用RevenueCat标准错误码
- 调整购买按钮高度和恢复购买按钮字体大小，改善UI体验
- 移除不必要的延迟和注释代码，提升代码质量

components/model/MembershipModal.tsx

@@ -1,8 +1,6 @@
 /* eslint-disable react-hooks/exhaustive-deps */
 import CustomCheckBox from '@/components/ui/CheckBox';
 import { USER_AGREEMENT_URL } from '@/constants/Agree';
-// import { useAuth } from '@/contexts/AuthContext';
-// import { UserApi } from '@/services';
 import { log, logger } from '@/utils/logger';
 import {
   captureMessage,
@@ -275,9 +273,6 @@ export function MembershipModal({ visible, onClose, onPurchaseSuccess }: Members
     capturePurchaseEvent('init', '开始获取会员产品套餐');
 
     try {
-      // 添加延迟，确保 RevenueCat SDK 完全初始化
-      await new Promise(resolve => setTimeout(resolve, 500));
-
       const offerings = await Purchases.getOfferings();
       log.info('获取产品套餐', { offerings });
 
@@ -639,27 +634,27 @@ export function MembershipModal({ visible, onClose, onPurchaseSuccess }: Members
       });
 
       // 处理不同类型的购买错误
-      if (error.code === 1 || error.code === 'USER_CANCELLED') {
+      if (error.userCancelled || error.code === Purchases.PURCHASES_ERROR_CODE.PURCHASE_CANCELLED_ERROR) {
         // 用户取消购买
         GlobalToast.show({
           message: '购买已取消',
         });
-      } else if (error.code === 'ITEM_ALREADY_OWNED' || error.code === 'PRODUCT_ALREADY_PURCHASED') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.PRODUCT_ALREADY_PURCHASED_ERROR) {
         // 商品已拥有
         GlobalToast.show({
           message: '您已拥有此商品',
         });
-      } else if (error.code === 'NETWORK_ERROR') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.NETWORK_ERROR) {
         // 网络错误
         GlobalToast.show({
           message: '网络连接失败',
         });
-      } else if (error.code === 'PAYMENT_PENDING') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.PAYMENT_PENDING_ERROR) {
         // 支付待处理
         GlobalToast.show({
           message: '支付正在处理中',
         });
-      } else if (error.code === 'INVALID_CREDENTIALS') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.INVALID_CREDENTIALS_ERROR) {
         // 凭据无效
         GlobalToast.show({
           message: '账户验证失败',
@@ -813,15 +808,15 @@ export function MembershipModal({ visible, onClose, onPurchaseSuccess }: Members
       capturePurchaseEvent('error', `恢复购买失败: ${errorData.message}`, errorData);
 
       // 处理特定的恢复购买错误
-      if (error.code === 'RESTORE_CANCELLED' || error.code === 'USER_CANCELLED') {
+      if (error.userCancelled || error.code === Purchases.PURCHASES_ERROR_CODE.PURCHASE_CANCELLED_ERROR) {
         GlobalToast.show({
           message: '恢复购买已取消',
         });
-      } else if (error.code === 'NETWORK_ERROR') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.NETWORK_ERROR) {
         GlobalToast.show({
           message: '网络错误',
         });
-      } else if (error.code === 'INVALID_CREDENTIALS') {
+      } else if (error.code === Purchases.PURCHASES_ERROR_CODE.INVALID_CREDENTIALS_ERROR) {
         GlobalToast.show({
           message: '账户验证失败',
         });
@@ -1400,7 +1395,7 @@ const styles = StyleSheet.create({
   },
   purchaseButton: {
     borderRadius: 28,
-    height: 52,
+    height: 64,
     justifyContent: 'center',
     alignItems: 'center',
     overflow: 'hidden',
@@ -1465,7 +1460,7 @@ const styles = StyleSheet.create({
   },
   restoreButtonText: {
     color: '#6F6F7A',
-    fontSize: 14,
+    fontSize: 12,
     fontWeight: '500',
   },
   disabledRestoreButton: {