feat(account): keep complaints on deletion, clear their typed-in contact; say so in the privacy draft

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01N4f2nya58RoRu4yEmJgRGE

frontend/src/components/account-deletion-section.tsx

@@ -65,7 +65,7 @@ export function AccountDeletionSection() {
           <ul>
             {ACCOUNT_DELETION_DELETED_ITEMS.map((item) => <li key={item}>{item}</li>)}
           </ul>
-          <p>剩余点数和会员权益会一并作废，不退款。订单和点数流水按法规保留，但不再与你的身份关联。</p>
+          <p>剩余点数和会员权益会一并作废，不退款。订单和点数流水按法规保留，但不再与你的身份关联；你提交过的反馈与投诉保留处理记录，其中的联系方式会删除。</p>
           <p className="account-deletion-contact">有疑问可以先联系我们：{LEGAL_ENTITY.contactEmail}</p>
           <label className="account-deletion-input">
             <span>输入「{ACCOUNT_DELETION_CONFIRM_WORD}」确认</span>