style: 新增背景，部分页面bbs适配移动端

Yi.Bbs.Vue3/src/views/login/forgotPassword.vue

@@ -128,7 +128,7 @@ const captcha = async () => {
   <div class="container">
     <!-- 找回密码 -->
     <div class="div-content">
-      <div class="div-right-register">
+      <div class="div-right-register div-logo">
         <img class="div-img" src="@/assets/login.png"/>
       </div>
       <div class="div-left-register">

Yi.Bbs.Vue3/src/views/login/login.vue

@@ -56,7 +56,7 @@
                     </div>
                 </div>
             </div>
-            <div class="div-right">
+            <div class="div-right div-logo">
 <img class="div-img" src="@/assets/login.png" alt=""/>
             </div>
         </div>
@@ -150,4 +150,5 @@ window.addEventListener("message", async (e) => {
 });
 </script>
 <style src="@/assets/styles/login.css" scoped>
+
 </style>

Yi.Bbs.Vue3/src/views/login/register.vue

@@ -139,7 +139,7 @@ const captcha = async () => {
   <div class="container">
   <!-- 注册 -->
   <div class="div-content">
-    <div class="div-right-register">
+    <div class="div-right-register div-logo">
       <img class="div-img" src="@/assets/login.png"/>
     </div>
     <div class="div-left-register">