feat: 移动端添加AI智能客服（悬浮按钮+聊天页面，对接扣子API）

pages/user/user.vue

@@ -15,6 +15,7 @@
                 <view :class="['tab', {active: tabIndex === 7}]" @click="handTab(7)">收款账号</view>
                 <view :class="['tab', {active: tabIndex === 9}]" @click="handTab(9)"  v-if="userData.userLevel > 1">新闻动态</view>
                 <view :class="['tab', {active: tabIndex === 2}]" @click="handTab(2)">修改密码</view>
+				<view :class="['tab', {active: tabIndex === 10}]" @click="$jump('/pages/ai/chat')">AI客服</view>
             </view>
         </u-sticky>
         <!-- 主要内容 -->
@@ -60,6 +61,10 @@
                 <news :user-data="userData"></news>
             </template>
         </view>
+		<!-- AI 客服悬浮按钮 -->
+		<view class="ai-float-btn" @click="$jump('/pages/ai/chat')">
+		    <u-icon name="kefu-ermai" size="48" color="#fff"></u-icon>
+		</view>
     </view>
 </template>
 
@@ -158,4 +163,22 @@ page {
         }
     }
 }
+.ai-float-btn {
+    position: fixed;
+    bottom: 195px;
+    right: 30rpx;
+    width: 100rpx;
+    height: 100rpx;
+    border-radius: 50%;
+    background: linear-gradient(135deg, #a92924, #d4574e);
+    display: flex;
+    align-items: center;
+    justify-content: center;
+    box-shadow: 0 4rpx 20rpx rgba(169, 41, 36, 0.4);
+    z-index: 999;
+}
+
+.ai-float-btn:active {
+    transform: scale(0.95);
+}
 </style>