feat(navigation): 导航状态改为三态：下线(0)、上线(1)、即将上线(2)

- 后端 NavigationStatusNames 更新为三个状态
- 前端表格状态列从 switch 改为 tag+dropdown
- 搜索和表单的状态选项同步更新

server/MiAssessment/src/MiAssessment.Admin.Business/Services/ContentService.cs

@@ -560,8 +560,9 @@ public class ContentService : IContentService
     /// </summary>
     private static readonly Dictionary<int, string> NavigationStatusNames = new()
     {
-        { 0, "即将上线" },
-        { 1, "已上线" }
+        { 0, "下线" },
+        { 1, "上线" },
+        { 2, "即将上线" }
     };
 
     /// <summary>

server/MiAssessment/src/MiAssessment.Admin/admin-web/src/views/business/content/navigation/index.vue

@@ -29,8 +29,9 @@
         </el-form-item>
         <el-form-item label="状态">
           <el-select v-model="queryParams.status" placeholder="请选择状态" clearable>
-            <el-option label="已上线" :value="1" />
-            <el-option label="即将上线" :value="0" />
+            <el-option label="上线" :value="1" />
+            <el-option label="下线" :value="0" />
+            <el-option label="即将上线" :value="2" />
           </el-select>
         </el-form-item>
         <el-form-item>
@@ -81,17 +82,25 @@
         </el-table-column>
 
         <!-- 状态 -->
-        <el-table-column label="状态" width="120" align="center">
+        <el-table-column label="状态" width="140" align="center">
           <template #default="{ row }">
-            <el-switch
-              v-model="row.status"
-              :active-value="1"
-              :inactive-value="0"
-              active-text="已上线"
-              inactive-text="即将上线"
-              :loading="row._statusLoading"
-              @change="(val: number) => handleStatusChange(row, val)"
-            />
+            <el-dropdown trigger="click" @command="(val: number) => handleStatusChange(row, val)">
+              <el-tag
+                :type="statusTagType(row.status)"
+                style="cursor: pointer;"
+                :loading="row._statusLoading"
+              >
+                {{ statusLabel(row.status) }}
+                <el-icon class="el-icon--right"><ArrowDown /></el-icon>
+              </el-tag>
+              <template #dropdown>
+                <el-dropdown-menu>
+                  <el-dropdown-item :command="1" :disabled="row.status === 1">上线</el-dropdown-item>
+                  <el-dropdown-item :command="0" :disabled="row.status === 0">下线</el-dropdown-item>
+                  <el-dropdown-item :command="2" :disabled="row.status === 2">即将上线</el-dropdown-item>
+                </el-dropdown-menu>
+              </template>
+            </el-dropdown>
           </template>
         </el-table-column>
 
@@ -191,8 +200,9 @@
 
         <el-form-item label="状态" prop="status" required>
           <el-select v-model="state.formData.status" placeholder="请选择状态">
-            <el-option label="已上线" :value="1" />
-            <el-option label="即将上线" :value="0" />
+            <el-option label="上线" :value="1" />
+            <el-option label="下线" :value="0" />
+            <el-option label="即将上线" :value="2" />
           </el-select>
         </el-form-item>
       </el-form>
@@ -213,7 +223,7 @@
  * @description 管理小程序首页导航入口卡片，支持图标上传、跳转配置和状态管理
  */
 import { reactive, ref, onMounted } from 'vue'
-import { Plus, Search, Refresh, Edit, Delete, Picture } from '@element-plus/icons-vue'
+import { Plus, Search, Refresh, Edit, Delete, Picture, ArrowDown } from '@element-plus/icons-vue'
 import { ElMessage, type FormInstance, type FormRules } from 'element-plus'
 import {
   getNavigationList,
@@ -297,6 +307,18 @@ function getDefaultFormData(): NavigationFormData {
   }
 }
 
+/** 状态文本映射 */
+function statusLabel(status: number): string {
+  const map: Record<number, string> = { 0: '下线', 1: '上线', 2: '即将上线' }
+  return map[status] ?? '未知'
+}
+
+/** 状态标签颜色映射 */
+function statusTagType(status: number): '' | 'success' | 'info' | 'warning' | 'danger' {
+  const map: Record<number, '' | 'success' | 'info' | 'warning' | 'danger'> = { 0: 'info', 1: 'success', 2: 'warning' }
+  return map[status] ?? 'info'
+}
+
 // ============ API Functions ============
 
 async function loadList() {
@@ -373,13 +395,14 @@ function handleEdit(row: NavigationItem) {
 }
 
 async function handleStatusChange(row: NavigationItem & { _statusLoading?: boolean }, status: number) {
+  const oldStatus = row.status
   row._statusLoading = true
   try {
     const res = await updateNavigationStatus({ id: row.id, status })
     if (res.code === 0) {
-      ElMessage.success(status === 1 ? '已上线' : '已设为即将上线')
+      row.status = status
+      ElMessage.success(`已设为${statusLabel(status)}`)
     } else {
-      row.status = status === 1 ? 0 : 1
       throw new Error(res.message || '状态更新失败')
     }
   } catch (error) {