feat(i18n): ④ l10n 漂移闸 + codegen 改纯 node 确定性输出

- gen_l10n_dart.mjs 去掉 dart format:其输出依赖包解析状态、跨环境不稳(首次 4 空格、
  重跑 8 空格),会让漂移闸误报。改为确定性终态格式(list 单行 const [])。
  analyze 不校验格式,不影响;gen 现零 dart 依赖、纯 node 确定。
- ci/check-codegen-drift.sh 增 l10n 段:重生成 strings_*.dart → git diff 非空即 fail
  (与 token 段同法,纯 node)。
- 验证:往返无损、重生成零 diff(闸稳定)、flutter analyze 0 issue、244 测试全绿。

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01A79VtQA1BwTuQN1ThpvYpo

client/lib/l10n/strings_en.dart

@@ -61,8 +61,7 @@ class StringsEn extends AppText {
   @override
   String get watchAdMore => 'Watch ad for more time';
   @override
-  String get quotaExhaustedNotice =>
-      'You\'ve used today\'s free time. Upgrade to keep connecting.';
+  String get quotaExhaustedNotice => 'You\'ve used today\'s free time. Upgrade to keep connecting.';
   @override
   String get adPlaying => 'Ad playing…';
   @override
@@ -70,8 +69,7 @@ class StringsEn extends AppText {
   @override
   String get quotaDesktopTitle => 'Daily free time used up';
   @override
-  String get quotaDesktopBody =>
-      'Watch ads in the mobile app to add time, or upgrade for unlimited access.';
+  String get quotaDesktopBody => 'Watch ads in the mobile app to add time, or upgrade for unlimited access.';
   @override
   String get gotIt => 'Got it';
   @override
@@ -81,16 +79,13 @@ class StringsEn extends AppText {
   @override
   String get smartSelect => 'Smart select';
   @override
-  String get nodeSwitchBody =>
-      'This disconnects the current link and reconnects to this node.';
+  String get nodeSwitchBody => 'This disconnects the current link and reconnects to this node.';
   @override
   String get nodeSwitchConfirm => 'Switch';
   @override
-  String get nodeUnhealthySwitched =>
-      'Current node unreachable — switched automatically';
+  String get nodeUnhealthySwitched => 'Current node unreachable — switched automatically';
   @override
-  String get nodeUnhealthyError =>
-      'Current node is unreachable — reconnect or switch node';
+  String get nodeUnhealthyError => 'Current node is unreachable — reconnect or switch node';
   @override
   String get nodeReconnecting => 'Network unstable, reconnecting…';
   @override
@@ -148,8 +143,7 @@ class StringsEn extends AppText {
   @override
   String get deviceLimitTitle => 'Device limit reached';
   @override
-  String get deviceLimitDesc =>
-      'Your plan allows up to %s devices. Remove one to continue.';
+  String get deviceLimitDesc => 'Your plan allows up to %s devices. Remove one to continue.';
   @override
   String get deviceLimitRemoveOldest => 'Remove least recently used';
   @override
@@ -179,18 +173,15 @@ class StringsEn extends AppText {
   @override
   String get devSave => 'Save';
   @override
-  String get devForceLogoutConfirm =>
-      'This revokes the device\'s login session — it will be kicked offline and must sign in again. The device stays in the list.';
+  String get devForceLogoutConfirm => 'This revokes the device\'s login session — it will be kicked offline and must sign in again. The device stays in the list.';
   @override
-  String get devClearLoginConfirm =>
-      'This removes the device from the list entirely and revokes its login session and data-plane credential. The device must sign in again to be used.';
+  String get devClearLoginConfirm => 'This removes the device from the list entirely and revokes its login session and data-plane credential. The device must sign in again to be used.';
   @override
   String get devCancel => 'Cancel';
   @override
   String get sessionRevokedTitle => 'This device was signed out';
   @override
-  String get sessionRevokedBody =>
-      'Your account signed this device out from another device. Please sign in again.';
+  String get sessionRevokedBody => 'Your account signed this device out from another device. Please sign in again.';
   @override
   String get sessionRevokedOk => 'Sign in again';
   @override
@@ -232,8 +223,7 @@ class StringsEn extends AppText {
   @override
   String get webUserCenter => 'User Center (Web)';
   @override
-  String get updateNotesFallback =>
-      'This update includes fixes and stability improvements.';
+  String get updateNotesFallback => 'This update includes fixes and stability improvements.';
   @override
   String get updateLater => 'Later';
   @override
@@ -279,8 +269,7 @@ class StringsEn extends AppText {
   @override
   String get contactTitle => 'Contact us';
   @override
-  String get contactIntro =>
-      'Need help? Reach us via any channel below — usually replies in minutes.';
+  String get contactIntro => 'Need help? Reach us via any channel below — usually replies in minutes.';
   @override
   String get contactEmail => 'Email support';
   @override
@@ -338,8 +327,7 @@ class StringsEn extends AppText {
   @override
   String get ob2Title => 'Allow network setup';
   @override
-  String get ob2Sub =>
-      'The system will ask to add a network profile to build the encrypted tunnel.';
+  String get ob2Sub => 'The system will ask to add a network profile to build the encrypted tunnel.';
   @override
   String get ob3Title => 'Private by design';
   @override
@@ -373,18 +361,15 @@ class StringsEn extends AppText {
   @override
   String get payNetworkLabel => 'Network';
   @override
-  String get payExactAmountHint =>
-      'Send the exact amount; activates automatically';
+  String get payExactAmountHint => 'Send the exact amount; activates automatically';
   @override
   String get copied => 'Copied';
   @override
   String get openAlipay => 'Pay with Alipay';
   @override
-  String get openAlipayHint =>
-      'Return after paying; this page refreshes automatically';
+  String get openAlipayHint => 'Return after paying; this page refreshes automatically';
   @override
-  String get openAlipayFailed =>
-      'Couldn\'t open Alipay; check it\'s installed or try again';
+  String get openAlipayFailed => 'Couldn\'t open Alipay; check it\'s installed or try again';
   @override
   String get awaitingPayment => 'Awaiting payment';
   @override
@@ -520,26 +505,11 @@ class StringsEn extends AppText {
   @override
   List<String> get days7 => const ['M', 'T', 'W', 'T', 'F', 'S', 'S'];
   @override
-  List<String> get featsFree => const [
-    '1 basic node only',
-    '10 min per day',
-    'Watch an ad to start',
-    '7-day free trial on sign-up',
-  ];
+  List<String> get featsFree => const ['1 basic node only', '10 min per day', 'Watch an ad to start', '7-day free trial on sign-up'];
   @override
-  List<String> get featsPro => const [
-    '80+ locations',
-    'Unlimited · fast',
-    '5 devices',
-    'Streaming optimized',
-  ];
+  List<String> get featsPro => const ['80+ locations', 'Unlimited · fast', '5 devices', 'Streaming optimized'];
   @override
-  List<String> get featsTeam => const [
-    'Everything in Pro',
-    '10 seats',
-    'Central billing',
-    'Priority support',
-  ];
+  List<String> get featsTeam => const ['Everything in Pro', '10 seats', 'Central billing', 'Priority support'];
   @override
   String adRewarded(int minutes) => '+$minutes min added';
   @override
@@ -547,8 +517,7 @@ class StringsEn extends AppText {
   @override
   String autoConnectingTo(String name) => 'Auto-connecting to $name…';
   @override
-  String updateAvailableTitle(String version) =>
-      'New version v$version available';
+  String updateAvailableTitle(String version) => 'New version v$version available';
   @override
   String codeSentTo(String email) => 'Code sent to $email';
 }