refactor(common): 重构宠物相关信息结构

- 修改 PetInfo 和 PetEffectInfo 结构体，统一字段命名规范
- 更新 SkillInfo 结构体，增加技能等级字段
- 删除未使用的 LoginUserInfo 和 ServerInfo 结构体
- 引入 google/uuid 包，用于后续可能的唯一标识生成

common/core/info/pet/PetStudySkillOutboundInfo.java

@@ -0,0 +1,17 @@
+package org.nieo.seerproject.common.net.info.pet;
+
+import lombok.Builder;
+import lombok.Data;
+import org.nieo.seerproject.common.annotations.OutboundMessageType;
+import org.nieo.seerproject.common.annotations.serialize.AutoCodec;
+import org.nieo.seerproject.common.annotations.serialize.UInt;
+import org.nieo.seerproject.common.net.MessageCommandIDRegistry;
+import org.nieo.seerproject.common.net.OutboundMessage;
+
+@Data
+@Builder
+@AutoCodec
+@OutboundMessageType(MessageCommandIDRegistry.Pet_Study_Skill)
+public class PetStudySkillOutboundInfo implements OutboundMessage {
+	private @UInt long catchTime;
+}