feat(portal): mount PuroLocaleSwitcher in Landing/Docs/AuthLayout

frontend/src/views/docs/DocsView.vue

@@ -11,13 +11,14 @@
           <span>PURO AI</span>
         </router-link>
         <div class="nav-links">
-          <router-link to="/">首页</router-link>
-          <a href="#codex">Codex</a>
-          <a href="#claude-code">Claude Code</a>
-          <a href="#curl">curl</a>
+          <router-link to="/">产品</router-link>
+          <router-link to="/pricing">定价</router-link>
+          <router-link to="/docs" class="active">文档</router-link>
         </div>
         <div class="nav-cta">
-          <router-link to="/login" class="btn btn-primary">登录 →</router-link>
+          <PuroLocaleSwitcher />
+          <router-link to="/login" class="btn btn-ghost">登录</router-link>
+          <router-link to="/register" class="btn btn-primary">注册</router-link>
         </div>
       </div>
     </nav>
@@ -251,8 +252,8 @@ requires_openai_auth = <span class="kw">true</span></code></pre>
 </template>
 
 <script setup lang="ts">
-// DocsView — public quickstart documentation
-// Route: /docs (no auth required)
+import PuroLocaleSwitcher from '@/components/puro/PuroLocaleSwitcher.vue'
+
 async function copyCode(ev: MouseEvent) {
   const button = ev.currentTarget as HTMLButtonElement
   const panel = button.closest('.code-panel')

frontend/src/views/landing/LandingView.vue

@@ -17,6 +17,7 @@
           <a href="/docs">文档</a>
         </div>
         <div class="nav-cta">
+          <PuroLocaleSwitcher />
           <router-link to="/login" class="btn btn-ghost">登录</router-link>
           <router-link to="/register" class="btn btn-primary">免费试用 →</router-link>
         </div>
@@ -329,8 +330,7 @@ requires_openai_auth = <span class="kw">true</span></code></pre>
 </template>
 
 <script setup lang="ts">
-// LandingView — public marketing landing page for PURO AI
-// Rendered at `/` when user is unauthenticated (see router/index.ts)
+import PuroLocaleSwitcher from '@/components/puro/PuroLocaleSwitcher.vue'
 </script>
 
 <style scoped>