fix(content): 修复导航列表查询EF Core LINQ翻译错误

- 将Dictionary.ContainsKey()从Select投影中移出
- 改为查询后在内存中映射StatusName
- 添加GetNavigationStatusName辅助方法

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

@@ -564,6 +564,16 @@ public class ContentService : IContentService
         { 1, "已上线" }
     };
 
+    /// <summary>
+    /// 获取导航状态名称
+    /// </summary>
+    /// <param name="status">状态值</param>
+    /// <returns>状态名称</returns>
+    private static string GetNavigationStatusName(int status)
+    {
+        return NavigationStatusNames.TryGetValue(status, out var name) ? name : "未知";
+    }
+
     /// <summary>
     /// 验证 Position 值
     /// </summary>
@@ -612,11 +622,16 @@ public class ContentService : IContentService
                 LinkUrl = n.LinkUrl,
                 Sort = n.Sort,
                 Status = n.Status,
-                StatusName = NavigationStatusNames.ContainsKey(n.Status) ? NavigationStatusNames[n.Status] : "未知",
                 CreateTime = n.CreateTime
             })
             .ToListAsync();
 
+        // 在内存中映射状态名称（避免 EF Core LINQ 翻译问题）
+        foreach (var item in items)
+        {
+            item.StatusName = GetNavigationStatusName(item.Status);
+        }
+
         return PagedResult<HomeNavigationDto>.Create(items, total, request.Page, request.PageSize);
     }
 
@@ -634,7 +649,6 @@ public class ContentService : IContentService
                 LinkUrl = n.LinkUrl,
                 Sort = n.Sort,
                 Status = n.Status,
-                StatusName = NavigationStatusNames.ContainsKey(n.Status) ? NavigationStatusNames[n.Status] : "未知",
                 CreateTime = n.CreateTime
             })
             .FirstOrDefaultAsync();
@@ -644,6 +658,9 @@ public class ContentService : IContentService
             throw new BusinessException(ErrorCodes.NavigationNotFound, "首页导航不存在");
         }
 
+        // 在内存中映射状态名称
+        nav.StatusName = GetNavigationStatusName(nav.Status);
+
         return nav;
     }