feat(system): 添加用户等级显示并更新赛事表单字段

- 在apiUsers表格中新增用户等级列，显示currentLevelCode字段
- 将tournaments表单中的赛事简介字段名称改为比赛规则
- 更新赛事简介输入框的占位符文本为"请输入赛事简介(比赛规则)"

src/views/system/business/apiUsers/index.vue

@@ -87,6 +87,7 @@
         <el-table-column label="用户姓名" align="center" prop="realName" />
         <el-table-column label="用户昵称" align="center" prop="nickName" />
         <el-table-column label="用户手机号码" align="center" prop="phone" />
+        <el-table-column label="用户等级" align="center" prop="currentLevelCode" />
         <el-table-column label="注册时间" align="center" prop="createAt" width="180">
           <template #default="scope">
             <span>{{ parseTime(scope.row.createAt, '{y}-{m}-{d} {h}:{i}:{s}') }}</span>

src/views/system/physical/tournaments/index.vue

@@ -323,11 +323,11 @@
             <el-button type="primary" @click="removeReward(index)" v-if="index !== 0 && dialog.mode !== 'view'">-</el-button>
           </div>
         </el-form-item>
-        <el-form-item label="赛事简介" prop="tournamentsIntroduction">
+        <el-form-item label="比赛规则" prop="tournamentsIntroduction">
           <el-input
             v-model="form.tournamentsIntroduction"
             type="textarea"
-            placeholder="请输入赛事简介"
+            placeholder="请输入赛事简介(比赛规则)"
             :disabled="dialog.mode === 'view'"
             :rows="4"
           />