feat(l10n): 账户入口 redeemEntry 改「Redeem」(去掉「& buy」,购买已独立成购买套餐行)

6 语言:Redeem/兑换/コード引き換え/코드 등록/Активация/Canjear;account golden 重录。

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

client/lib/l10n/strings_ko.dart

@@ -198,7 +198,7 @@ class StringsKo extends AppText {
   @override
   String get sessionRevokedOk => '다시 로그인';
   @override
-  String get redeemEntry => '코드 등록 및 구매';
+  String get redeemEntry => '코드 등록';
   @override
   String get contactEntry => '문의하기';
   @override