fix(client): 设置页购买入口改为显示套餐(PurchaseScreen)而非兑换/去哪买链接

- 「购买套餐」→ PurchaseScreen(渠道 switch + 三档套餐 + 下单),不再进 RedeemScreen 的引流卡
- bump 1.0.69+70

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_013nMthbVEmQquxBRKb9Fj8u

client/lib/screens/settings_page.dart

@@ -15,10 +15,11 @@ import '../state/app_providers.dart';
 import '../state/navigation_provider.dart';
 import '../state/settings_provider.dart';
 import '../state/update_provider.dart';
-import '../widgets/account_screens.dart';
 import '../widgets/pangolin_icons.dart';
 import '../widgets/pangolin_toast.dart';
 import 'orders_page.dart';
+import 'payment_page.dart';
+import 'purchase_page.dart';
 /// 「检查更新」手动触发:拉取 `$kApiBaseUrl/version`,失败/无更新走轻提示,
 /// 有更新则清掉「已忽略版本」→ 顶部更新 banner 显示 + toast(不弹窗)。
 Future<void> _checkForUpdate(BuildContext context, WidgetRef ref, AppText t) async {
@@ -70,11 +71,18 @@ class SettingsPage extends ConsumerWidget {
       child: ConstrainedBox(
         constraints: const BoxConstraints(maxWidth: 560),
         child: Column(crossAxisAlignment: CrossAxisAlignment.stretch, children: [
-          // 兑换 & 购买 + 我的订单
+          // 购买套餐 + 我的订单
           _Card(children: [
-            _Row(title: t.redeemEntry, sub: t.proMember,
+            _Row(title: t.purchaseTitle, sub: t.proMember,
                 right: Icon(PangolinIcons.chevronRight, size: 18, color: c.fg3),
-                onTap: () => open(NavView.redeem, RedeemScreen(t: t))),
+                onTap: () => open(
+                      NavView.purchase,
+                      PurchaseScreen(
+                        t: t,
+                        onOrderCreated: () => Navigator.of(context)
+                            .push(MaterialPageRoute(builder: (_) => PaymentScreen(t: t))),
+                      ),
+                    )),
             _Row(title: t.ordersTitle, last: true,
                 right: Icon(PangolinIcons.chevronRight, size: 18, color: c.fg3),
                 onTap: () => open(NavView.orders, OrdersScreen(t: t))),