fix(web): 同步 features 页导航与 nav.njk 一致（补「库存」「审核流」链接）

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

web/features/approval.html

@@ -934,7 +934,9 @@ footer { background: var(--gray-25); border-top: 1px solid var(--border-subtle);
       <img src="../assets/logo-full.svg" alt="岩美" />
     </a>
     <div class="topnav-links">
-      <a href="/#modules" class="active">产品</a>
+      <a href="/#modules">产品</a>
+      <a href="/features/inventory.html">库存</a>
+      <a href="/features/approval.html" class="active">审核流</a>
       <a href="/#pricing">价格</a>
       <a href="/download/">下载</a>
       <a href="/docs/">文档</a>
@@ -947,6 +949,8 @@ footer { background: var(--gray-25); border-top: 1px solid var(--border-subtle);
   </div>
   <div class="nav-mobile-menu" id="nav-mobile-menu">
     <a href="/#modules">产品</a>
+    <a href="/features/inventory.html">库存管理</a>
+    <a href="/features/approval.html">审核流</a>
     <a href="/#pricing">价格</a>
     <a href="/download/">下载</a>
     <a href="/docs/">文档</a>

web/features/inventory.html

@@ -676,7 +676,9 @@ footer { background: var(--gray-25); border-top: 1px solid var(--border-subtle);
       <img src="../assets/logo-full.svg" alt="岩美" />
     </a>
     <div class="topnav-links">
-      <a href="/#modules" class="active">产品</a>
+      <a href="/#modules">产品</a>
+      <a href="/features/inventory.html" class="active">库存</a>
+      <a href="/features/approval.html">审核流</a>
       <a href="/#pricing">价格</a>
       <a href="/download/">下载</a>
       <a href="/docs/">文档</a>
@@ -689,6 +691,8 @@ footer { background: var(--gray-25); border-top: 1px solid var(--border-subtle);
   </div>
   <div class="nav-mobile-menu" id="nav-mobile-menu">
     <a href="/#modules">产品</a>
+    <a href="/features/inventory.html">库存管理</a>
+    <a href="/features/approval.html">审核流</a>
     <a href="/#pricing">价格</a>
     <a href="/download/">下载</a>
     <a href="/docs/">文档</a>