refactor: 完善枚举系统与状态类型转换，新增枚举管理接口

1. 为所有枚举添加Description特性用于中文描述
2. 移除实体类中冗余的状态字段注释与定义
3. 将所有枚举状态参数改为int类型转换，统一数据交互格式
4. 新增系统管理枚举查询接口与实现，支持获取所有枚举元数据
5. 调整宠物服务模板状态更新接口参数类型

QYZH.InteractiveMagazine.Service/UserJournalService.cs

@@ -50,7 +50,7 @@ public class UserJournalService(
         }
 
         // 校验期刊状态
-        if (journal.Status != JournalStatusEnum.Published)
+        if (journal.Status != (int)JournalStatusEnum.Published)
         {
             logger.LogWarning("绑定期刊失败，期刊未发布，JournalId: {JournalId}, Status: {Status}", input.JournalId, journal.Status);
             throw new BusinessException("该期刊暂未发布，无法绑定", 400);
@@ -77,7 +77,7 @@ public class UserJournalService(
             JournalId = input.JournalId,
             Id = input.Id,
             Type = Enum.Parse<UserJournalTypeEnum>(input.Type, true),
-            Status = UserJournalStatusEnum.Active,
+            Status = (int)UserJournalStatusEnum.Active,
             IsDeleted = false,
             CreatedBy = userId.ToString(),
             CreatedAt = DateTime.Now,