feat: disable user messaging and retain公益 service guidance

miniapp/pages/activity-mutual-waiting/activity-mutual-waiting.wxml

@@ -7,21 +7,20 @@
   <view class="status-section" wx:if="{{bothConfirmed}}">
     <view class="success-icon">✅</view>
     <text class="success-title">双方已确认！</text>
-    <text class="success-hint">你们可以开始聊天了</text>
-    <button class="chat-btn" bindtap="openChat">开启聊天</button>
+    <text class="success-hint">双方意向已确认，可查看公益活动和服务站</text>
   </view>
 
   <view class="status-section" wx:elif="{{myConfirmed}}">
     <view class="waiting-icon">⏳</view>
     <text class="waiting-title">已发送邀请</text>
-    <text class="waiting-hint">对方确认后你们可以开始聊天</text>
+    <text class="waiting-hint">对方确认后将收到平台通知</text>
     <button class="decline-btn" bindtap="onDecline">暂不联系</button>
   </view>
 
   <view class="status-section" wx:else>
     <view class="pending-icon">💬</view>
     <text class="pending-title">向对方表达兴趣</text>
-    <text class="pending-hint">双方确认后才能开启线上沟通</text>
+    <text class="pending-hint">双方确认后将收到平台通知，并可查看公益服务</text>
     <button class="confirm-btn" bindtap="onConfirm">确认开启沟通</button>
   </view>
 </view>