服务层重构与优化：补全所有ServiceImpl实现类，修复RestTemplate注入，完善DTO与配置，保证编译与启动通过

backend-single/src/main/java/com/emotion/dto/request/AiChatRequest.java

@@ -0,0 +1,33 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * AI聊天请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class AiChatRequest extends BaseRequest {
+    
+    /**
+     * 会话ID
+     */
+    private String conversationId;
+    
+    /**
+     * 消息内容
+     */
+    @NotBlank(message = "消息内容不能为空")
+    private String message;
+    
+    /**
+     * 用户ID
+     */
+    private String userId;
+} 

backend-single/src/main/java/com/emotion/dto/request/AiSummaryRequest.java

@@ -0,0 +1,28 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * AI总结请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class AiSummaryRequest extends BaseRequest {
+    
+    /**
+     * 会话ID
+     */
+    @NotBlank(message = "会话ID不能为空")
+    private String conversationId;
+    
+    /**
+     * 用户ID
+     */
+    private String userId;
+} 

backend-single/src/main/java/com/emotion/dto/request/ChatStatsRequest.java

@@ -0,0 +1,25 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+/**
+ * 聊天统计请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class ChatStatsRequest extends BaseRequest {
+    
+    /**
+     * 用户ID
+     */
+    private String userId;
+    
+    /**
+     * 会话ID
+     */
+    private String conversationId;
+} 

backend-single/src/main/java/com/emotion/dto/request/ConversationCreateRequest.java

@@ -0,0 +1,33 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * 对话创建请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class ConversationCreateRequest extends BaseRequest {
+
+    /**
+     * 用户ID
+     */
+    @NotBlank(message = "用户ID不能为空")
+    private String userId;
+
+    /**
+     * 对话标题
+     */
+    private String title;
+
+    /**
+     * 对话类型
+     */
+    private String type;
+}

backend-single/src/main/java/com/emotion/dto/request/GuestChatRequest.java

@@ -0,0 +1,23 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * 访客聊天请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class GuestChatRequest extends BaseRequest {
+
+    /**
+     * 消息内容
+     */
+    @NotBlank(message = "消息内容不能为空")
+    private String message;
+}

backend-single/src/main/java/com/emotion/dto/request/MessageCreateRequest.java

@@ -0,0 +1,50 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * 消息创建请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class MessageCreateRequest extends BaseRequest {
+    
+    /**
+     * 会话ID
+     */
+    @NotBlank(message = "会话ID不能为空")
+    private String conversationId;
+
+    /**
+     * 用户ID
+     */
+    @NotBlank(message = "用户ID不能为空")
+    private String userId;
+
+    /**
+     * 消息内容
+     */
+    @NotBlank(message = "消息内容不能为空")
+    private String content;
+
+    /**
+     * 内容类型
+     */
+    private String contentType;
+    
+    /**
+     * 发送者类型
+     */
+    private String senderType;
+    
+    /**
+     * 发送者ID
+     */
+    private String senderId;
+} 

backend-single/src/main/java/com/emotion/dto/request/RefreshTokenRequest.java

@@ -0,0 +1,23 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.NotBlank;
+
+/**
+ * 刷新令牌请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class RefreshTokenRequest extends BaseRequest {
+    
+    /**
+     * 刷新令牌
+     */
+    @NotBlank(message = "刷新令牌不能为空")
+    private String refreshToken;
+} 

backend-single/src/main/java/com/emotion/dto/request/UserUpdateRequest.java

@@ -0,0 +1,50 @@
+package com.emotion.dto.request;
+
+import lombok.Data;
+import lombok.EqualsAndHashCode;
+
+import javax.validation.constraints.Email;
+import javax.validation.constraints.Pattern;
+
+/**
+ * 用户更新请求类
+ * 
+ * @author emotion-museum
+ * @date 2025-07-24
+ */
+@Data
+@EqualsAndHashCode(callSuper = true)
+public class UserUpdateRequest extends BaseRequest {
+    
+    /**
+     * 用户名
+     */
+    private String username;
+    
+    /**
+     * 昵称
+     */
+    private String nickname;
+    
+    /**
+     * 邮箱
+     */
+    @Email(message = "邮箱格式不正确")
+    private String email;
+    
+    /**
+     * 手机号
+     */
+    @Pattern(regexp = "^1[3-9]\\d{9}$", message = "手机号格式不正确")
+    private String phone;
+    
+    /**
+     * 头像
+     */
+    private String avatar;
+    
+    /**
+     * 状态
+     */
+    private Integer status;
+}