feat: hide subscription entry on index page when smart_mode_free

miniprogram/pages/index/index.wxml

@@ -24,7 +24,7 @@
       <button class="btn-reconnect" bindtap="onConnectBle" wx:if="{{!connected}}">重新连接</button>
     </view>
 
-    <view class="sub-info" bindtap="onViewSubscription">
+    <view class="sub-info" bindtap="onViewSubscription" wx:if="{{!subscription || subscription.plan !== 'free'}}">
       <view class="sub-info-left">
         <text class="sub-info-icon">💳</text>
         <text wx:if="{{subscription && subscription.status === 'active'}}">智能模式 · 剩余{{subRemaining}}天</text>
@@ -32,6 +32,12 @@
       </view>
       <text class="sub-info-arrow">›</text>
     </view>
+    <view class="sub-info" wx:if="{{subscription && subscription.plan === 'free'}}">
+      <view class="sub-info-left">
+        <text class="sub-info-icon">✨</text>
+        <text>智能模式已开放</text>
+      </view>
+    </view>
 
     <view class="action-buttons">
       <button class="btn-primary" bindtap="onStartTreatment">开始使用</button>