修复精准查找对拉黑关系显示"添加"，跟实际能不能添加对不上（第5章复测发现）

/users/search 返回结果本身带 relationship 字段，服务端 imRelationshipAction() 对
blocked_by_me/blocked_by_peer 都明确映射成 action:"none"（不允许发起添加）——但
前端 actionLabel 只认 friend/pending_outbound/pending_inbound 三种，其余（含两种
拉黑关系）一律落到兜底的"添加"文案。点进去虽然会跳到资料页、由资料页自己的
cannotAddReason 挡住（不会真的误发出申请），但列表这一行本身的文案是误导的。
补上跟 Profile 组件里已有的 cannotAddReason 一致的两条文案（已拉黑/无法添加），
只是精简成适合一行列表项的长度。

Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>

src/views/contact-management-view.jsx

@@ -265,8 +265,14 @@ function AddFriend({result = false, onToast, onOpenScanner}) {
       return undefined;
     }).catch(err => onToast(err.message || '生成邀请链接失败'));
   };
+  // Real search results carry a relationship for blocked pairs too (blocked_by_me/blocked_by_peer),
+  // which previously fell through to the same generic "添加" as an untouched stranger -- misleading
+  // since tapping through leads to a profile page whose own cannotAddReason (see the Profile
+  // component below) already refuses to let the request go anywhere. Matches that component's
+  // wording, just condensed to fit this one-line list item.
   const actionLabel = item => item.relationship === 'friend' ? '已是好友' :
-    item.relationship === 'pending_outbound' ? '已申请' : item.relationship === 'pending_inbound' ? '待通过' : '添加';
+    item.relationship === 'pending_outbound' ? '已申请' : item.relationship === 'pending_inbound' ? '待通过' :
+    item.relationship === 'blocked_by_me' ? '已拉黑' : item.relationship === 'blocked_by_peer' ? '无法添加' : '添加';
   return <div className="people-page"><Header title="添加好友" back="address-book" />
     <Search value={query} onChange={v => { setQuery(v); if (!v.trim()) { setSearched(false); setResults([]); } }} placeholder="查找账号" onSubmit={() => runSearch(query)} />
     <main>