修改前端界面小问题

cmc-temperature-ui/src/views/login.vue

     <!-- 顶部标题区域 -->
     <div class="login-header">
       <h1 class="main-title">{{ title }}</h1>
-      <p class="sub-title">Water Temperature Monitoring System</p>
     </div>
     
     <!-- 登录表单区域 -->

cmc-temperature-ui/src/views/temperature/TemperatureChart.vue

         saveAsImage: {
           name: '温度监控趋势图',
           type: 'png',
-          backgroundColor: '#11183c',
           title: '下载温度监控趋势图',
-          titleColor: '#303133',
         }
       }
     },