Drop the login-key issue client and fix hint punctuation

Why: independent review flagged the issue client still targeting the 410
endpoint and a hint sentence ending with a period.
Evidence: npm run build + npm test re-run on the fix (SELF).
Impact: api client surface only.
Refs: review brief /tmp/review-brief-admin-user-contract.md

src/api.ts

@@ -86,9 +86,8 @@ export const api = {
   listAdminUsers: () => auth.fetch(`${BASE}/api/admin/users`).then(r => json<{ owner: string; name: string; isAdmin: boolean; mustChangePassword: boolean; hasPassword: boolean; passwordSetAt?: string; createdAt: string }[]>(r)),
   // 建号只创建待初始化账号（无密码、无权限位）；初始凭证由服务器本地 CLI 发放激活 Key。
   createAdminUser: (owner: string, name: string) => auth.fetch(`${BASE}/api/admin/users`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ owner, profile: { name } }) }).then(r => json<{ owner: string; initializationState: string }>(r)),
-  // ---- 管理员：一次性登录 Key（HTTP 签发端点已被恢复提案契约替换为 410；
+  // ---- 管理员：一次性登录 Key（HTTP 签发端点已被恢复提案契约替换为 410，客户端方法随之移除；
   // list/revoke 仍有效，供恢复提案视图复用；兑换入口不变）----
-  adminIssueLoginKey: (owner: string, ttlMinutes?: number) => auth.fetch(`${BASE}/api/admin/users/${encodeURIComponent(owner)}/login-keys`, { method: 'POST', headers: { 'Content-Type': 'application/json' }, body: JSON.stringify({ purpose: 'recover', ...(ttlMinutes ? { ttlMinutes } : {}) }) }).then(r => json<{ id: string; owner: string; purpose: string; status: string; expiresAt: string; key: string }>(r)),
   adminListLoginKeys: (owner: string) => auth.fetch(`${BASE}/api/admin/users/${encodeURIComponent(owner)}/login-keys`).then(r => json<{ keys: { id: string; owner: string; purpose: string; status: string; expiresAt: string; createdAt: string; createdBy?: string }[] }>(r)).then(d => d.keys ?? []),
   adminRevokeLoginKey: (owner: string, id: string) => auth.fetch(`${BASE}/api/admin/users/${encodeURIComponent(owner)}/login-keys/${encodeURIComponent(id)}`, { method: 'DELETE' }).then(r => json<{ ok: boolean }>(r)),
   adminExecEnv: () => auth.fetch(`${BASE}/api/admin/exec-env`).then(r => json<ExecEnvView>(r)),

src/components/adminSections.tsx

@@ -49,7 +49,7 @@ export function UsersPanel() {
             <input className="lg-input" placeholder="显示名（可空）" value={name} onChange={e => setName(e.target.value)} />
             <button className="lg-submit ad-create-btn" disabled={busy || !owner.trim()} onClick={create}>创建账号</button>
           </div>
-          <p className="ad-hint">账号创建后处于待初始化状态：在服务器执行 user initialize-account 发放一次性激活 Key，用户经兑换入口设置密码后登录。</p>
+          <p className="ad-hint">账号创建后处于待初始化状态：在服务器执行 user initialize-account 发放一次性激活 Key，用户经兑换入口设置密码后登录</p>
         </div>
       )}
       {notice && <div className="ad-notice"><Icon name="check" size={14} />{notice}</div>}