style(home): 替换首页背景图并调整卡片样式，新增设备连接入口

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

miniprogram/pages/home/home.wxml

@@ -1,5 +1,7 @@
 <view class="home">
-	<view class="bg"></view>
+	<view class="bg">
+		<image src="/images/home/bg.jpg" mode="aspectFit" />
+	</view>
 
 	<view class="home-container page-container">
 		<view class="title">
@@ -60,6 +62,12 @@
 			</view>
 		</view>
 
+		<view class="connect">
+			<view>
+				<image src="/images/home/lianjie.png" mode="aspectFit" />
+			</view>
+		</view>
+
 		<view class="detailedData">
 			<view class="detailedDataTitle">
 				<view></view>