feat(client): pay v2 支付渠道 switch + 订单列表/详情端到端

购买/支付(Phase B):
- 新 SegSwitch 段控 widget(镜像 .segswitch 原子)
- 购买页重构:顶部支付渠道 switch(默认 USDT→加密货币 / 人民币→支付宝),套餐价随渠道分币种显示,删底部弹窗选方式;点购买直达支付页
- 支付页加订单信息卡(套餐/渠道/金额按币种)
- models:PayChannel + PayCatalogItem.priceUsdtMicro/priceLabel(ch)/perMonthLabel(ch)

订单(P0,全新):
- payment_api.listOrders() + orders_provider(列表 + 详情 family)
- OrdersScreen 列表→详情(状态 pill / 可复制订单号 / 继续支付·重新购买)
- 导航:NavView.orders + desktop_shell 分支 + account 入口

配套:
- l10n +19 getter(支付渠道 4 + 订单 15)×6 语言,l10n 闸绿
- 图标单源迁移 lucide_icons_flutter + pangolin_icons.dart(codegen)
- 联系渠道订正(Telegram/邮件 support@yanmeiai.com/官网) + 前端去广告&时长
- 测试:购买 switch 分币种 + 订单列表/空态/详情 + 假 API listOrders;golden 重录
- flutter analyze 0 error,flutter test 226 全绿

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

client/test/unit/connection_watchdog_test.dart

@@ -330,8 +330,9 @@ void main() {
     await tester.pump();
   });
 
-  // 免费版 10 分钟卡控:连接期倒计时,墙上时钟越过额度即自动切断 + 本地置耗尽(#21)。
-  testWidgets('免费额度倒计时归零 → 自动切断 + 置耗尽', (tester) async {
+  // 免费版 10 分钟卡控(enforcement):连接期锁定额度,墙上时钟越过额度即自动切断 +
+  // 本地置耗尽(#21;额度倒计时 UI 已移除,只保留到点即切的强制行为)。
+  testWidgets('免费额度到点 → 自动切断 + 置耗尽', (tester) async {
     final bridge = _FakeBridge();
     var fake = DateTime(2026, 7, 1, 12);
     final c = makeContainer(bridge, now: () => fake); // 未登录默认免费,剩余 10 分钟
@@ -341,7 +342,7 @@ void main() {
     c.read(nodesProvider);
     await tester.pump();
 
-    // 免费默认剩余 10 分钟 → toggle 触发 _connect 锁定 600s 倒计时(fake api 抛错不影响锁定)。
+    // 免费默认剩余 10 分钟 → toggle 触发 _connect 锁定 600s 额度(fake api 抛错不影响锁定)。
     expect(c.read(quotaProvider).remainingMinutes, 10);
     c.read(connectionProvider.notifier).toggle();
     await tester.pump();
@@ -349,7 +350,6 @@ void main() {
     await tester.pump();
     await tester.pump();
     expect(c.read(connectionProvider).phase, VpnPhase.on);
-    expect(c.read(connectionProvider).freeCountdown, isNotNull, reason: '连接期应有倒计时');
 
     // 快进墙上时钟越过 10 分钟 → 下一个 1s tick 触发 _refreshElapsed → 切断。
     fake = fake.add(const Duration(seconds: 601));

client/test/unit/payment_api_test.dart

@@ -3,6 +3,7 @@ import 'package:http/http.dart' as http;
 import 'package:http/testing.dart';
 import 'package:pangolin_vpn/services/api_client.dart';
 import 'package:pangolin_vpn/services/auth_api.dart';
+import 'package:pangolin_vpn/models/payment.dart';
 import 'package:pangolin_vpn/services/payment_api.dart';
 
 ApiClient _client(MockClient mock) => ApiClient(
@@ -25,7 +26,7 @@ void main() {
     final items = await api.catalog();
     expect(items.length, 3);
     expect(items.first.sku, 'pro_month');
-    expect(items.first.priceLabel(), '¥29.99');
+    expect(items.first.priceLabel(PayChannel.cny), '¥29.99');
   });
 
   test('createOrder 只传 sku+method+metadata,解析 session', () async {

client/test/unit/payment_flow_test.dart

@@ -15,6 +15,9 @@ class _FakePaymentApi implements PaymentApi {
   @override
   Future<List<PayCatalogItem>> catalog() async => const [];
 
+  @override
+  Future<List<PayOrderSummary>> listOrders() async => const [];
+
   @override
   Future<PayOrder> createOrder({required String sku, required String method, Map<String, String>? metadata}) async {
     createCalls++;

client/test/widget/connect_button_test.dart

@@ -30,7 +30,7 @@ void main() {
   testWidgets('connecting 态:loader 图标', (tester) async {
     await tester.pumpWidget(button(VpnPhase.connecting));
     await tester.pump(const Duration(milliseconds: 100));
-    expect(find.byIcon(PangolinIcons.loader), findsOneWidget);
+    expect(find.byIcon(PangolinIcons.loaderCircle), findsOneWidget);
   });
 
   testWidgets('on 态:盾勾 + 计时 + 已加密', (tester) async {

client/test/widget/orders_page_test.dart

@@ -0,0 +1,85 @@
+// orders_page_test.dart — 订单列表/详情页行为测试(不打网络,provider 注入)。
+import 'package:flutter/material.dart';
+import 'package:flutter_test/flutter_test.dart';
+import 'package:pangolin_vpn/l10n/strings_zh.dart';
+import 'package:pangolin_vpn/models/payment.dart';
+import 'package:pangolin_vpn/screens/orders_page.dart';
+import 'package:pangolin_vpn/state/orders_provider.dart';
+import 'package:pangolin_vpn/widgets/status_pill.dart';
+
+import '../helpers/harness.dart';
+
+final t = StringsZh();
+
+final _orders = <PayOrderSummary>[
+  PayOrderSummary(
+      orderNo: 'o-year', sku: 'pro_year', plan: 'pro', days: 366, method: 'crypto',
+      status: 'paid', amountMinor: 34990000, currency: 'USDT',
+      createdAt: DateTime.utc(2026, 7, 10), paidAt: DateTime.utc(2026, 7, 10)),
+  PayOrderSummary(
+      orderNo: 'o-month', sku: 'pro_month', plan: 'pro', days: 31, method: 'alipay',
+      status: 'created', amountMinor: 2999, currency: 'CNY',
+      createdAt: DateTime.utc(2026, 7, 11)),
+  PayOrderSummary(
+      orderNo: 'o-q', sku: 'pro_quarter', plan: 'pro', days: 92, method: 'nezha',
+      status: 'canceled', amountMinor: 6888, currency: 'CNY',
+      createdAt: DateTime.utc(2026, 7, 9)),
+];
+
+void main() {
+  setUpAll(disableGoogleFontsFetching);
+
+  testWidgets('订单列表:三单渲染 + 结算币种金额 + 状态 pill', (tester) async {
+    tester.view.physicalSize = const Size(800, 2400);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.reset);
+    await tester.pumpWidget(wrapThemed(
+      OrdersScreen(t: t, embedded: true),
+      overrides: [ordersProvider.overrideWith((ref) async => _orders)],
+    ));
+    await tester.pumpAndSettle();
+
+    // 套餐名(逐档)
+    expect(find.text(t.proYearly), findsOneWidget);
+    expect(find.text(t.proMonthly), findsOneWidget);
+    expect(find.text(t.proQuarterly), findsOneWidget);
+    // 金额按结算币种(USDT $ / CNY ¥),在「金额 · 日期」子行里
+    expect(find.textContaining(r'$34.99'), findsOneWidget);
+    expect(find.textContaining('¥29.99'), findsOneWidget);
+    // 状态 pill(created→等待付款 / paid→已开通 / canceled→已取消)
+    expect(find.byType(StatusPill), findsNWidgets(3));
+    expect(find.text(t.awaitingPayment), findsOneWidget);
+    expect(find.text(t.orderStatusPaid), findsOneWidget);
+    expect(find.text(t.orderStatusCanceled), findsOneWidget);
+  });
+
+  testWidgets('订单空态', (tester) async {
+    await tester.pumpWidget(wrapThemed(
+      OrdersScreen(t: t, embedded: true),
+      overrides: [ordersProvider.overrideWith((ref) async => const <PayOrderSummary>[])],
+    ));
+    await tester.pumpAndSettle();
+    expect(find.text(t.ordersEmpty), findsOneWidget);
+  });
+
+  testWidgets('点 created 单进详情:显订单号 + 继续支付', (tester) async {
+    tester.view.physicalSize = const Size(800, 2400);
+    tester.view.devicePixelRatio = 1.0;
+    addTearDown(tester.view.reset);
+    await tester.pumpWidget(wrapThemed(
+      OrdersScreen(t: t, embedded: true),
+      overrides: [
+        ordersProvider.overrideWith((ref) async => _orders),
+        orderDetailProvider('o-month').overrideWith((ref) async => PayOrderStatus(
+              orderNo: 'o-month', payStatus: 'pending', activated: false, summary: _orders[1])),
+      ],
+    ));
+    await tester.pumpAndSettle();
+    // 点 created 那单(月付)进详情
+    await tester.tap(find.text(t.proMonthly));
+    await tester.pumpAndSettle();
+    // 详情字段行 + created 态动作「继续支付」
+    expect(find.text(t.orderNoLabel), findsOneWidget);
+    expect(find.text(t.orderContinuePay), findsWidgets);
+  });
+}

client/test/widget/payment_pages_test.dart

@@ -13,9 +13,9 @@ import 'package:pangolin_vpn/widgets/plan_card.dart';
 import '../helpers/harness.dart';
 
 const _items = [
-  PayCatalogItem(sku: 'pro_month', plan: 'pro', days: 31, priceMinor: 2999, currency: 'CNY'),
-  PayCatalogItem(sku: 'pro_quarter', plan: 'pro', days: 92, priceMinor: 6888, currency: 'CNY'),
-  PayCatalogItem(sku: 'pro_year', plan: 'pro', days: 366, priceMinor: 19999, currency: 'CNY'),
+  PayCatalogItem(sku: 'pro_month', plan: 'pro', days: 31, priceMinor: 2999, currency: 'CNY', priceUsdtMicro: 4990000),
+  PayCatalogItem(sku: 'pro_quarter', plan: 'pro', days: 92, priceMinor: 6888, currency: 'CNY', priceUsdtMicro: 12990000),
+  PayCatalogItem(sku: 'pro_year', plan: 'pro', days: 366, priceMinor: 19999, currency: 'CNY', priceUsdtMicro: 34990000),
 ];
 
 /// 轮询生命周期测试专用假 API:记 orderStatus / cancel 调用次数,其余按最小实现返回。
@@ -26,6 +26,9 @@ class _PollingFakePaymentApi implements PaymentApi {
   @override
   Future<List<PayCatalogItem>> catalog() async => const [];
 
+  @override
+  Future<List<PayOrderSummary>> listOrders() async => const [];
+
   @override
   Future<PayOrder> createOrder({required String sku, required String method, Map<String, String>? metadata}) async =>
       const PayOrder(
@@ -66,9 +69,15 @@ void main() {
     ));
     await tester.pumpAndSettle();
     expect(find.byType(PlanCard), findsNWidgets(3));
+    expect(find.text(t.proQuarterly), findsOneWidget);
+    // 默认支付渠道 = USDT → 套餐价显 USDT
+    expect(find.text('\$4.99'), findsOneWidget);
+    expect(find.text('\$34.99'), findsOneWidget);
+    // 切到人民币渠道 → 套餐价改显 ¥
+    await tester.tap(find.text(t.payChannelCny));
+    await tester.pumpAndSettle();
     expect(find.text('¥29.99'), findsOneWidget);
     expect(find.text('¥199.99'), findsOneWidget);
-    expect(find.text(t.proQuarterly), findsOneWidget);
   });
 
   testWidgets('支付页 crypto_address:地址/金额/复制,金额用 mono', (tester) async {