feat: 图片适配

pages/chat/ChatTopWelcome.vue

@@ -5,8 +5,9 @@
       <image
         class="top-item-left"
         :src="initPageImages.welcomeImageUrl"
+        mode="aspectFit"
       ></image>
-      <image class="top-item-right" :src="initPageImages.logoImageUrl"></image>
+      <image class="top-item-right" :src="initPageImages.logoImageUrl" mode="aspectFit"></image>
     </view>
     <ChatCardAI v-if="welcomeContent.length" :text="welcomeContent" />
   </view>