refactor(admin): 重构部分页面样式代码，修剪多余代码

- 将AdminView中的header和main标签替换为el-header和el-main组件
- 移除自定义的导航菜单样式，使用Element Plus的导航组件
- 将管理员下拉菜单替换为el-dropdown组件
- 更新所有颜色变量为Element Plus的CSS变量
- 移除自定义按钮和表单样式，统一使用Element Plus组件
- 优化响应式布局和间距处理

web/src/views/admin/TokenDetailView.vue

@@ -318,7 +318,6 @@ const statCards = [
 
 <style scoped>
 .token-detail {
-  max-width: 1600px;
   margin: 0 auto;
   width: 100%;
   padding: 0;
@@ -345,7 +344,7 @@ const statCards = [
 }
 
 .no-permission-text {
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
 }
 
 /* Token 选择 */
@@ -359,7 +358,7 @@ const statCards = [
 
 .update-time {
   font-size: 13px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
 }
 
 /* 信息卡片 */
@@ -411,14 +410,14 @@ const statCards = [
 
 .stat-label {
   font-size: 13px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
   margin-bottom: 4px;
 }
 
 .stat-value {
   font-size: 18px;
   font-weight: 600;
-  color: var(--text-primary);
+  color: var(--el-text-color-primary);
   word-break: break-all;
 }
 
@@ -430,7 +429,7 @@ const statCards = [
 .section-subtitle {
   font-size: 14px;
   font-weight: 600;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
   margin: 24px 0 16px;
 }
 
@@ -462,12 +461,12 @@ const statCards = [
   display: flex;
   align-items: center;
   justify-content: center;
-  background: var(--primary-color);
+  background: var(--el-color-primary);
   color: #fff;
 }
 
 .action-icon.warning {
-  background: var(--warning-color);
+  background: var(--el-color-warning);
 }
 
 .action-info {
@@ -478,13 +477,13 @@ const statCards = [
 .action-label {
   font-size: 15px;
   font-weight: 600;
-  color: var(--text-primary);
+  color: var(--el-text-color-primary);
   margin-bottom: 4px;
 }
 
 .action-desc {
   font-size: 13px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
 }
 
 /* 空状态 */
@@ -493,7 +492,7 @@ const statCards = [
   flex-direction: column;
   align-items: center;
   padding: 64px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
 }
 
 .empty-text {

web/src/views/admin/TokenManageView.vue

@@ -261,7 +261,8 @@ const deleteToken = async (row: any) => {
             <span class="table-count">共 {{ tableData.length }} 条</span>
           </div>
 
-          <el-table :data="tableData" v-loading="loading" stripe style="width: 100%">
+          <el-table empty-text="没有数据" stripe style="width: 100%"
+                    :data="tableData" v-loading="loading">
             <el-table-column prop="token" label="Token" min-width="100" show-overflow-tooltip>
               <template #default="{ row }">
                 <div class="token-cell">
@@ -385,7 +386,6 @@ const deleteToken = async (row: any) => {
 
 <style scoped>
 .token-manage {
-  max-width: 1600px;
   margin: 0 auto;
   width: 100%;
   padding: 0;
@@ -416,13 +416,13 @@ const deleteToken = async (row: any) => {
 .login-title {
   font-size: 24px;
   font-weight: 600;
-  color: var(--text-primary);
+  color: var(--el-text-color-primary);
   margin-bottom: 8px;
 }
 
 .login-subtitle {
   font-size: 14px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
   margin-bottom: 32px;
 }
 
@@ -446,7 +446,7 @@ const deleteToken = async (row: any) => {
 .form-title {
   font-size: 15px;
   font-weight: 600;
-  color: var(--text-primary);
+  color: var(--el-text-color-primary);
   margin-bottom: 16px;
 }
 
@@ -479,7 +479,7 @@ const deleteToken = async (row: any) => {
 
 .table-count {
   font-size: 13px;
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
 }
 
 .token-cell {
@@ -494,7 +494,7 @@ const deleteToken = async (row: any) => {
 }
 
 .notes-text {
-  color: var(--text-secondary);
+  color: var(--el-text-color-secondary);
   overflow: hidden;
   text-overflow: ellipsis;
   white-space: nowrap;