feat: enhance dark mode support across various components

- Updated styles in AccountSetting, SystemConfig, Version, and other components to improve dark mode visibility.
- Added dark mode classes for text and background colors to ensure better contrast and readability.
- Modified CSS variables in dark.css for consistent theming.
- Improved accessibility by ensuring all text elements are legible in dark mode.

src/pages/home/components/TaskOperationDialog.vue

@@ -1,6 +1,6 @@
 <template>
-  <el-dialog v-model="isVisible" :title="title" width="480" align-center>
-    <el-form :model="form" :rules="rules" ref="formRef" label-position="top" class="pl-4 pr-4 pt-4">
+  <el-dialog v-model="isVisible" :title="title" width="480" align-center class="dark-dialog">
+    <el-form :model="form" :rules="rules" ref="formRef" label-position="top" class="pl-4 pr-4 pt-4 dark-form">
       <el-form-item label="选择房型" prop="roomType">
         <el-select v-model="form.roomType" placeholder="请选择房型">
           <el-option v-for="item in roomList" :label="item.pmsName" :value="item.id" />