feat: 三端设备index页恢复员工登录入口卡片

- 验收秤index: 添加员工登录卡片
- 营养秤index: 添加员工登录卡片
- 加工毛菜秤index: 添加员工登录卡片

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

other-module/canteen-device/canteen-nutrition-scale/index.html

@@ -85,6 +85,11 @@
   </div>
 
   <div class="main-content">
+    <a class="card" href="00-login.html">
+      <span class="card__icon">&#x1F510;</span>
+      <div class="card__title">员工登录</div>
+      <div class="card__desc">人脸识别、账号密码登录</div>
+    </a>
     <a class="card" href="01-meal-start.html">
       <span class="card__icon">&#x1F37D;&#xFE0F;</span>
       <div class="card__title">开餐界面</div>

other-module/canteen-device/raw-veg-inspection-scale/index.html

@@ -43,6 +43,14 @@
   </div>
 
   <div class="main-content">
+    <a class="card" href="00-login.html">
+      <span class="card__icon">&#x1F510;</span>
+      <div class="card__info">
+        <div class="card__title">员工登录</div>
+        <div class="card__desc">人脸识别、账号密码登录</div>
+      </div>
+      <span class="card__arrow">&#x203A;</span>
+    </a>
     <a class="card" href="01-verify-inspection.html">
       <span class="card__icon">&#x2696;&#xFE0F;</span>
       <div class="card__info">

other-module/canteen-device/raw-veg-processing-scale/index.html

@@ -27,6 +27,14 @@
     <span class="top-bar__title">加工毛菜秤</span>
   </div>
   <div class="main-content">
+    <a class="card" href="00-login.html">
+      <span class="card__icon">&#x1F510;</span>
+      <div class="card__info">
+        <div class="card__title">员工登录</div>
+        <div class="card__desc">人脸识别、账号密码登录</div>
+      </div>
+      <span class="card__arrow">&#x203A;</span>
+    </a>
     <a class="card" href="01-washing-tasks.html">
       <span class="card__icon">&#x1F4CB;</span>
       <div class="card__info">