feat(client): P4 节点实测延迟/设备/套餐价/兑换/统计接真(#6 6D)

- latency_probe.dart:并行 TCP 握手实测各节点 per-client RTT(服务端无法代知)。
- nodes_provider:解析 /v1/nodes 的 host/port,后台测延迟回填 Node.ping;智能选择
  按实测最小;去掉 8 个伪造演示节点(空列表用中性占位,不再伪造服务器)。
- Node:+host/port/copyWith/pingLabel(未测显示 —);各端 ping 显示改 pingLabel。
- account_screens:PlansScreen 接 /v1/plans(价格 priceLabel + me 标当前档);
  DevicesScreen 接 /v1/me/devices + 移除 DELETE + last_seen;RedeemScreen 接
  /v1/redeem(成功刷新 me,失败显示后端文案)。
- stats_page:周柱接 me.weekly_gb,本月流量/时长接 usage(30),延迟用生效节点实测。
- 顺带补登记早前 log_time.dart 的删除(log.dart 重构遗漏 stage)。

flutter analyze 0 error;115 tests passed;受影响 4 golden 重生成。
本机设备高亮 + 真实 device id 随 P6(device_info_plus)落地。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

client/lib/widgets/account_screens.dart

@@ -3,9 +3,13 @@
 // 文案全部经 AppText(l10n,单显)。套餐数字以 design/CLAUDE.md §7 为准。
 // App 内无任何支付表单——购买仅引导至外部渠道。
 import 'package:flutter/material.dart';
+import 'package:flutter_riverpod/flutter_riverpod.dart';
 
 import '../l10n/app_text.dart';
+import '../models/device.dart';
 import '../pangolin_theme.dart';
+import '../services/auth_api.dart';
+import '../state/account_providers.dart';
 import 'pangolin_button.dart';
 import 'pangolin_icons.dart';
 import 'plan_card.dart';
@@ -43,133 +47,149 @@ class _SubScaffold extends StatelessWidget {
   }
 }
 
-/// ── 套餐选择 ──
-class PlansScreen extends StatelessWidget {
+/// ── 套餐选择 ── (价格/额度来自 GET /v1/plans;当前档由 me.plan 判定;
+/// 功能清单仍取 l10n,后端无此字段)
+class PlansScreen extends ConsumerWidget {
   const PlansScreen({super.key, required this.t, this.onChoose, this.onBack, this.embedded = false});
   final AppText t;
   final ValueChanged<String>? onChoose;
   final VoidCallback? onBack;
   final bool embedded;
 
+  List<String> _feats(String code) => switch (code) {
+        'free' => t.featsFree,
+        'pro' => t.featsPro,
+        'team' => t.featsTeam,
+        _ => const [],
+      };
+
   @override
-  Widget build(BuildContext context) {
-    final plans = [
-      (id: 'free', name: t.freePlan, price: '¥0', cta: t.current, featured: false, current: true, pop: null as String?, feats: t.featsFree),
-      (id: 'pro', name: t.proPlan, price: '¥25', cta: t.upgrade, featured: true, current: false, pop: t.mostPopular, feats: t.featsPro),
-      (id: 'team', name: t.teamPlan, price: '¥99', cta: t.choose, featured: false, current: false, pop: null as String?, feats: t.featsTeam),
-    ];
-    return _SubScaffold(
-      title: t.choosePlan,
-      onBack: onBack,
-      embedded: embedded,
-      child: ListView(
-        padding: const EdgeInsets.fromLTRB(20, 14, 20, 24),
-        children: [
-          for (final p in plans)
-            Padding(
-              padding: EdgeInsets.only(bottom: 14, top: p.pop != null ? 12 : 0),
-              child: PlanCard(
-                name: p.name, price: p.price, period: t.perMonth,
-                features: p.feats, ctaLabel: p.cta, featured: p.featured, isCurrent: p.current,
-                popularLabel: p.pop, onPressed: () => onChoose?.call(p.id),
-              ),
-            ),
-        ],
-      ),
-    );
+  Widget build(BuildContext context, WidgetRef ref) {
+    final c = context.pangolin;
+    final plansAsync = ref.watch(plansProvider);
+    final myPlan = ref.watch(meProvider).valueOrNull?.plan ?? 'free';
+
+    Widget body() => plansAsync.when(
+          loading: () => const Center(child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
+          error: (_, __) => Center(
+              child: Padding(padding: const EdgeInsets.all(40), child: Text(t.lang == AppLang.zh ? '加载失败,请重试' : 'Failed to load, retry', style: PangolinText.body.copyWith(color: c.fg3)))),
+          data: (plans) => ListView(
+            padding: const EdgeInsets.fromLTRB(20, 14, 20, 24),
+            children: [
+              for (final p in plans)
+                Padding(
+                  padding: EdgeInsets.only(bottom: 14, top: p.code == 'pro' ? 12 : 0),
+                  child: PlanCard(
+                    name: p.localizedName(t.lang),
+                    price: p.priceLabel(),
+                    period: t.perMonth,
+                    features: _feats(p.code),
+                    ctaLabel: p.code == myPlan ? t.current : (p.code == 'team' ? t.choose : t.upgrade),
+                    featured: p.code == 'pro',
+                    isCurrent: p.code == myPlan,
+                    popularLabel: p.code == 'pro' ? t.mostPopular : null,
+                    onPressed: () => onChoose?.call(p.code),
+                  ),
+                ),
+            ],
+          ),
+        );
+
+    return _SubScaffold(title: t.choosePlan, onBack: onBack, embedded: embedded, child: body());
   }
 }
 
-/// ── 设备管理 ──
-class DeviceItem {
-  const DeviceItem({required this.id, required this.icon, required this.name, required this.os, required this.active, this.me = false});
-  final String id, name, os, active;
-  final IconData icon;
-  final bool me;
-}
-
-class DevicesScreen extends StatefulWidget {
+/// ── 设备管理 ── (真实 GET /v1/me/devices;移除 = DELETE。本机高亮待 P6 设备 id)
+class DevicesScreen extends ConsumerWidget {
   const DevicesScreen({super.key, required this.t, this.onBack, this.embedded = false});
   final AppText t;
   final VoidCallback? onBack;
   final bool embedded;
-  @override
-  State<DevicesScreen> createState() => _DevicesScreenState();
-}
 
-class _DevicesScreenState extends State<DevicesScreen> {
-  late List<DeviceItem> _devices = [
-    DeviceItem(id: '1', icon: PangolinIcons.laptop, name: 'MacBook Pro', os: 'macOS 26', active: widget.t.thisDevice, me: true),
-    DeviceItem(id: '2', icon: PangolinIcons.smartphone, name: 'iPhone 17', os: 'iOS 26', active: '2 min'),
-    DeviceItem(id: '3', icon: PangolinIcons.monitorSmartphone, name: 'iPad Air', os: 'iPadOS 26', active: widget.t.lang == AppLang.zh ? '3 小时前' : '3h ago'),
-  ];
+  IconData _icon(String platform) => switch (platform.toLowerCase()) {
+        'ios' || 'android' => PangolinIcons.smartphone,
+        'macos' || 'windows' || 'linux' => PangolinIcons.laptop,
+        _ => PangolinIcons.monitorSmartphone,
+      };
 
-  @override
-  Widget build(BuildContext context) {
-    final c = context.pangolin;
-    return _SubScaffold(
-      title: widget.t.myDevices,
-      onBack: widget.onBack,
-      embedded: widget.embedded,
-      child: ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
-        Text(widget.t.devicesSub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
-        const SizedBox(height: 12),
-        Container(
-          decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
-          clipBehavior: Clip.antiAlias,
-          child: Column(children: [
-            for (var i = 0; i < _devices.length; i++) _row(c, _devices[i], i < _devices.length - 1),
-          ]),
-        ),
-      ]),
-    );
+  String _lastSeen(DateTime? ts) {
+    final zh = t.lang == AppLang.zh;
+    if (ts == null) return zh ? '从未在线' : 'never';
+    final d = DateTime.now().difference(ts.toLocal());
+    if (d.inMinutes < 1) return zh ? '刚刚' : 'just now';
+    if (d.inMinutes < 60) return zh ? '${d.inMinutes} 分钟前' : '${d.inMinutes} min ago';
+    if (d.inHours < 24) return zh ? '${d.inHours} 小时前' : '${d.inHours}h ago';
+    return zh ? '${d.inDays} 天前' : '${d.inDays}d ago';
   }
 
-  Widget _row(PangolinScheme c, DeviceItem d, bool divider) {
+  @override
+  Widget build(BuildContext context, WidgetRef ref) {
+    final c = context.pangolin;
+    final devicesAsync = ref.watch(devicesProvider);
+
+    Widget content() => devicesAsync.when(
+          loading: () => const Center(child: Padding(padding: EdgeInsets.all(40), child: CircularProgressIndicator())),
+          error: (_, __) => Center(
+              child: Padding(padding: const EdgeInsets.all(40), child: Text(t.lang == AppLang.zh ? '加载失败,请重试' : 'Failed to load, retry', style: PangolinText.body.copyWith(color: c.fg3)))),
+          data: (devices) => ListView(padding: const EdgeInsets.fromLTRB(20, 4, 20, 24), children: [
+            Text(t.devicesSub, style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
+            const SizedBox(height: 12),
+            if (devices.isEmpty)
+              Text(t.lang == AppLang.zh ? '暂无已登录设备' : 'No devices yet',
+                  style: PangolinText.sm.copyWith(color: c.fg3))
+            else
+              Container(
+                decoration: BoxDecoration(color: c.surface, borderRadius: BorderRadius.circular(PangolinRadius.lg), border: Border.all(color: c.border), boxShadow: PangolinShadow.sm),
+                clipBehavior: Clip.antiAlias,
+                child: Column(children: [
+                  for (var i = 0; i < devices.length; i++) _row(ref, c, devices[i], i < devices.length - 1),
+                ]),
+              ),
+          ]),
+        );
+
+    return _SubScaffold(title: t.myDevices, onBack: onBack, embedded: embedded, child: content());
+  }
+
+  Widget _row(WidgetRef ref, PangolinScheme c, Device d, bool divider) {
+    final name = d.name.isNotEmpty ? d.name : d.platform;
     return Container(
       decoration: BoxDecoration(border: divider ? Border(bottom: BorderSide(color: c.border)) : null),
       padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
       child: Row(children: [
         Container(width: 38, height: 38, decoration: BoxDecoration(color: c.accentSubtle, borderRadius: BorderRadius.circular(PangolinRadius.md)),
-            child: Icon(d.icon, size: 19, color: c.accent)),
+            child: Icon(_icon(d.platform), size: 19, color: c.accent)),
         const SizedBox(width: 12),
         Expanded(child: Column(crossAxisAlignment: CrossAxisAlignment.start, children: [
-          Row(children: [
-            Flexible(child: Text(d.name, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontSize: 14.5))),
-            if (d.me)
-              Container(
-                margin: const EdgeInsets.only(left: 7), padding: const EdgeInsets.symmetric(horizontal: 7, vertical: 1),
-                decoration: BoxDecoration(color: c.successSubtle, borderRadius: BorderRadius.circular(PangolinRadius.full)),
-                child: Text(d.active, style: PangolinText.caption.copyWith(color: c.success, fontWeight: FontWeight.w600, fontSize: 10.5)),
-              ),
-          ]),
+          Text(name, style: PangolinText.sm.copyWith(color: c.fg1, fontWeight: FontWeight.w600, fontSize: 14.5)),
           const SizedBox(height: 1),
-          Text(d.me ? d.os : '${d.os} · ${d.active}', style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
+          Text('${d.platform} · ${_lastSeen(d.lastSeen)}', style: PangolinText.caption.copyWith(color: c.fg3, fontWeight: FontWeight.w400)),
         ])),
-        if (!d.me)
-          OutlinedButton(
-            onPressed: () => setState(() => _devices.removeWhere((x) => x.id == d.id)),
-            style: OutlinedButton.styleFrom(foregroundColor: c.fg2, side: BorderSide(color: c.borderStrong, width: 1.5), shape: const StadiumBorder(), padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 7), minimumSize: Size.zero),
-            child: Text(widget.t.remove, style: PangolinText.caption.copyWith(fontWeight: FontWeight.w600)),
-          ),
+        OutlinedButton(
+          onPressed: () => ref.read(devicesProvider.notifier).remove(d.uuid),
+          style: OutlinedButton.styleFrom(foregroundColor: c.fg2, side: BorderSide(color: c.borderStrong, width: 1.5), shape: const StadiumBorder(), padding: const EdgeInsets.symmetric(horizontal: 14, vertical: 7), minimumSize: Size.zero),
+          child: Text(t.remove, style: PangolinText.caption.copyWith(fontWeight: FontWeight.w600)),
+        ),
       ]),
     );
   }
 }
 
-/// ── 兑换 & 购买 ──
-class RedeemScreen extends StatefulWidget {
+/// ── 兑换 & 购买 ── (兑换码走 POST /v1/redeem,成功后刷新账户)
+class RedeemScreen extends ConsumerStatefulWidget {
   const RedeemScreen({super.key, required this.t, this.onBack, this.embedded = false});
   final AppText t;
   final VoidCallback? onBack;
   final bool embedded;
   @override
-  State<RedeemScreen> createState() => _RedeemScreenState();
+  ConsumerState<RedeemScreen> createState() => _RedeemScreenState();
 }
 
-class _RedeemScreenState extends State<RedeemScreen> {
+class _RedeemScreenState extends ConsumerState<RedeemScreen> {
   final _code = TextEditingController();
   bool _ok = false;
+  bool _busy = false;
+  String? _err;
 
   @override
   void dispose() {
@@ -177,6 +197,25 @@ class _RedeemScreenState extends State<RedeemScreen> {
     super.dispose();
   }
 
+  Future<void> _redeem() async {
+    final code = _code.text.trim();
+    if (code.isEmpty) return;
+    setState(() {
+      _busy = true;
+      _err = null;
+    });
+    try {
+      await ref.read(accountApiProvider).redeem(code);
+      // 订阅变化 → 刷新账户聚合,套餐横幅/额度随之更新。
+      await ref.read(meProvider.notifier).refresh();
+      if (mounted) setState(() => _ok = true);
+    } on AuthApiException catch (e) {
+      if (mounted) setState(() => _err = widget.t.lang == AppLang.zh ? e.messageZh : e.messageEn);
+    } finally {
+      if (mounted) setState(() => _busy = false);
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final c = context.pangolin;
@@ -218,8 +257,12 @@ class _RedeemScreenState extends State<RedeemScreen> {
                   ),
                 )),
                 const SizedBox(width: 10),
-                PangolinButton(label: t.redeemBtn, onPressed: _code.text.trim().length >= 4 ? () => setState(() => _ok = true) : null),
+                PangolinButton(label: t.redeemBtn, onPressed: (_busy || _code.text.trim().length < 4) ? null : _redeem),
               ]),
+            if (_err != null) ...[
+              const SizedBox(height: 10),
+              Text(_err!, style: PangolinText.caption.copyWith(color: c.danger, fontWeight: FontWeight.w500)),
+            ],
           ]),
         ),
         const SizedBox(height: 22),

client/lib/widgets/server_tile.dart

@@ -65,7 +65,7 @@ class ServerTile extends StatelessWidget {
                 ],
               ),
             ),
-            Text('${node.ping}ms', style: PangolinText.mono.copyWith(color: c.fg2, fontSize: 12)),
+            Text(node.pingLabel, style: PangolinText.mono.copyWith(color: c.fg2, fontSize: 12)),
             const SizedBox(width: 8),
             SignalBars(ping: node.ping),
             if (active) ...[const SizedBox(width: 10), Icon(PangolinIcons.check, size: 18, color: c.accent)],