feat(l10n): 邀请/通知/设置分组文案 ×6 语言(Spec ②③占位)

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/lib/l10n/strings_zh.dart

@@ -463,4 +463,48 @@ class StringsZh extends AppText {
   String get orderRebuy => '重新购买';
   @override
   String get payMethodNezha => '哪吒支付';
+
+  // ── 邀请 / 通知 / 设置分组 / 订单过期(Spec ②③占位) ──
+  @override
+  String get inviteEntry => '邀请好友得会员';
+  @override
+  String get inviteEntrySub => '好友注册 · 双方都得会员天数';
+  @override
+  String get inviteTitle => '邀请好友';
+  @override
+  String get inviteCodeLabel => '邀请码';
+  @override
+  String get inviteLinkLabel => '邀请链接';
+  @override
+  String get inviteCopyCode => '复制邀请码';
+  @override
+  String get inviteCopyLink => '复制链接';
+  @override
+  String get inviteRewardsTitle => '奖励规则';
+  @override
+  String get inviteRewardRegister => '好友注册 · 双方各得 3 天';
+  @override
+  String get inviteRewardFirstBuy => '好友首购 · 双方各得 15 天';
+  @override
+  String get inviteRewardJoinTg => '加入 TG 频道 · 得 3 天';
+  @override
+  String get inviteProgressTitle => '我的奖励';
+  @override
+  String get notifTitle => '通知';
+  @override
+  String get notifEmpty => '暂无通知';
+  @override
+  String get notifTypeNews => '新闻';
+  @override
+  String get notifTypeFeature => '功能';
+  @override
+  String get notifTypeImportant => '重要';
+  @override
+  String get settingsGroupConn => '连接';
+  @override
+  String get settingsGroupAppearance => '外观';
+  @override
+  String get settingsGroupAbout => '关于';
+  @override
+  String get orderStatusExpired => '已过期';
 }