feat: 精简登录页面

- 使用纯色背景替代背景图片 (#28273a)
- 隐藏第三方登录入口 (使用v-if保留逻辑)
- 修改底部 Copyright 为 NJCQ Tech

参考项目: otc-boot/plus-ui-ts

plus-ui/src/views/login.vue

@@ -44,7 +44,7 @@
         </div>
       </el-form-item>
       <el-checkbox v-model="loginForm.rememberMe" style="margin: 0 0 25px 0">{{ proxy.$t('login.rememberPassword') }}</el-checkbox>
-      <el-form-item style="float: right">
+      <el-form-item v-if="false" style="float: right">
         <el-button circle :title="proxy.$t('login.social.wechat')" @click="doSocialLogin('wechat')">
           <svg-icon icon-class="wechat" />
         </el-button>
@@ -73,7 +73,7 @@
     </el-form>
     <!--  底部  -->
     <div class="el-login-footer">
-      <span>Copyright © 2018-2025 疯狂的狮子Li All Rights Reserved.</span>
+      <span>Copyright © 2021-2025 NJCQ Tech All Rights Reserved.</span>
     </div>
   </div>
 </template>
@@ -236,8 +236,9 @@ onMounted(() => {
   justify-content: center;
   align-items: center;
   height: 100%;
-  background-image: url('../assets/images/login-background.jpg');
+  // background-image: url('../assets/images/login-background.jpg');
-  background-size: cover;
+  background-color: #28273a;
+  // background-size: cover;
 }
 
 .title-box {