fix(docs): remove iShare mention (puro 独立运营定位)

- docs.sections.getKey.note 键从 zh/en 删除
- DocsView 对应 <p class="note"> 段删掉
- 全仓再次 grep 确认无其他 ishare/iShare 引用

frontend/src/i18n/locales/en.ts

@@ -5921,7 +5921,6 @@ export default {
       getKey: {
         heading: '1. Get your API key',
         desc: 'PURO AI is currently invite-only. Contact the admin to get access:',
-        note: 'Subscription self-purchase via the iShare portal is coming soon.',
       },
       codex: {
         heading: '2. Codex CLI setup',

frontend/src/i18n/locales/zh.ts

@@ -6114,7 +6114,6 @@ export default {
       getKey: {
         heading: '1. 获取 API key',
         desc: '当前 PURO AI 不开放自助注册付费。联系管理员获取：',
-        note: '未来通过 iShare 入口开放订阅购买。',
       },
       codex: {
         heading: '2. Codex CLI 接入',

frontend/src/views/docs/DocsView.vue

@@ -12,7 +12,6 @@
         <div class="callout">
           <a href="mailto:admin@puro.im">admin@puro.im</a>
         </div>
-        <p class="note">{{ $t('docs.sections.getKey.note') }}</p>
       </section>
 
       <section id="codex" class="docs-section">