refactor(pet): 重构宠物模块实体与接口

1. 将原Pet实体重命名为UserPet，新增PetTemplate模板实体拆分宠物模板与实例数据
2. 调整IPetService泛型参数为IBaseService<UserPet>
3. 补充宠物模板相关字段与查询逻辑，完善创建默认宠物的流程
4. 替换所有Pet实体引用为UserPet，修正相关服务层查询与更新逻辑

QYZH.InteractiveMagazine.Models/Entity/PetTemplate.cs

@@ -0,0 +1,62 @@
+using SqlSugar;
+
+namespace QYZH.InteractiveMagazine.Models.Entity
+{
+    /// <summary>
+    /// 宠物模板表（定义不同宠物种类，支持后期多宠物扩展）
+    /// </summary>
+    [SugarTable("PetTemplate")]
+    public partial class PetTemplate : SqlSugarBaseEntity
+    {
+        public PetTemplate() { }
+
+        /// <summary>
+        /// Desc:模板名称
+        /// Default:
+        /// Nullable:False
+        /// </summary>
+        public string Name { get; set; }
+
+        /// <summary>
+        /// Desc:模板描述
+        /// Default:
+        /// Nullable:True
+        /// </summary>
+        public string Description { get; set; }
+
+        /// <summary>
+        /// Desc:默认初始进化形态Id（关联PetEvolution.Id）
+        /// Default:
+        /// Nullable:False
+        /// </summary>
+        public long DefaultEvolutionId { get; set; }
+
+        /// <summary>
+        /// Desc:模板图标地址
+        /// Default:
+        /// Nullable:True
+        /// </summary>
+        public string IconUrl { get; set; }
+
+        /// <summary>
+        /// Desc:排序权重
+        /// Default:0
+        /// Nullable:False
+        /// </summary>
+        public int SortOrder { get; set; }
+
+        /// <summary>
+        /// Desc:模板类型: Normal, Special, Limited
+        /// Default:Normal
+        /// Nullable:False
+        /// </summary>
+        public string Type { get; set; }
+
+        /// <summary>
+        /// Desc:状态: Active, Inactive
+        /// Default:Active
+        /// Nullable:False
+        /// </summary>
+        public new string Status { get; set; }
+    }
+}