新增会话管理功能，包括获取会话列表、获取会话详情和删除会话的API，更新AI教练模块以支持会话模型，调整相关服务和数据传输对象。

src/users/users.service.ts

@@ -80,18 +80,19 @@ export class UsersService {
         };
       }
 
-      const profile = await this.userProfileModel.findByPk(existingUser.id);
+      const [profile] = await this.userProfileModel.findOrCreate({
+        where: { userId: existingUser.id },
+        defaults: { userId: existingUser.id },
+      });
       const returnData = {
         ...existingUser.toJSON(),
         maxUsageCount: DEFAULT_FREE_USAGE_COUNT,
         isVip: existingUser.isVip,
-        profile: profile ? {
-          dailyStepsGoal: profile.dailyStepsGoal,
-          dailyCaloriesGoal: profile.dailyCaloriesGoal,
-          pilatesPurposes: profile.pilatesPurposes,
-          weight: profile.weight,
-          height: profile.height,
-        } : undefined,
+        dailyStepsGoal: profile?.dailyStepsGoal,
+        dailyCaloriesGoal: profile?.dailyCaloriesGoal,
+        pilatesPurposes: profile?.pilatesPurposes,
+        weight: profile?.weight,
+        height: profile?.height,
       }
 
       this.logger.log(`getProfile returnData: ${JSON.stringify(returnData, null, 2)}`);