feat: 优化AI教练聊天逻辑，增加用户聊天次数检查和响应内容

- 在AI教练控制器中添加用户聊天次数检查，若次数用完则返回相应提示信息。
- 更新AI聊天响应DTO，新增用户剩余聊天次数和AI回复文本字段，提升用户体验。
- 修改用户服务，支持初始体重和目标体重字段的更新，增强用户资料的完整性。

src/users/users.service.ts

@@ -108,6 +108,8 @@ export class UsersService {
         dailyCaloriesGoal: profile?.dailyCaloriesGoal,
         pilatesPurposes: profile?.pilatesPurposes,
         weight: profile?.weight,
+        initialWeight: profile?.initialWeight,
+        targetWeight: profile?.targetWeight,
         height: profile?.height,
         activityLevel: profile?.activityLevel,
       }
@@ -179,7 +181,7 @@ export class UsersService {
 
   // 更新用户昵称、头像
   async updateUser(updateUserDto: UpdateUserDto): Promise<UpdateUserResponseDto> {
-    const { userId, name, avatar, gender, birthDate, dailyStepsGoal, dailyCaloriesGoal, pilatesPurposes, weight, height, activityLevel } = updateUserDto;
+    const { userId, name, avatar, gender, birthDate, dailyStepsGoal, dailyCaloriesGoal, pilatesPurposes, weight, initialWeight, targetWeight, height, activityLevel } = updateUserDto;
 
     this.logger.log(`updateUser: ${JSON.stringify(updateUserDto, null, 2)}`);
 
@@ -215,7 +217,7 @@ export class UsersService {
     await user.save();
 
     // 更新或创建扩展信息
-    if (dailyStepsGoal !== undefined || dailyCaloriesGoal !== undefined || pilatesPurposes !== undefined || weight !== undefined || height !== undefined || activityLevel !== undefined) {
+    if (dailyStepsGoal !== undefined || dailyCaloriesGoal !== undefined || pilatesPurposes !== undefined || weight !== undefined || initialWeight !== undefined || targetWeight !== undefined || height !== undefined || activityLevel !== undefined) {
       const [profile] = await this.userProfileModel.findOrCreate({
         where: { userId },
         defaults: { userId },
@@ -232,6 +234,14 @@ export class UsersService {
         }
         profileChanges.weight = weight;
       }
+      if (initialWeight !== undefined) {
+        profile.initialWeight = initialWeight;
+        profileChanges.initialWeight = initialWeight;
+      }
+      if (targetWeight !== undefined) {
+        profile.targetWeight = targetWeight;
+        profileChanges.targetWeight = targetWeight;
+      }
       if (height !== undefined) {
         profile.height = height;
         profileChanges.height = height;
@@ -650,6 +660,8 @@ export class UsersService {
           dailyCaloriesGoal: profileForLogin.dailyCaloriesGoal,
           pilatesPurposes: profileForLogin.pilatesPurposes,
           weight: profileForLogin.weight,
+          initialWeight: profileForLogin.initialWeight,
+          targetWeight: profileForLogin.targetWeight,
           height: profileForLogin.height,
           activityLevel: profileForLogin.activityLevel,
         } : undefined,
@@ -862,6 +874,8 @@ export class UsersService {
           dailyCaloriesGoal: profileForGuest.dailyCaloriesGoal,
           pilatesPurposes: profileForGuest.pilatesPurposes,
           weight: profileForGuest.weight,
+          initialWeight: profileForGuest.initialWeight,
+          targetWeight: profileForGuest.targetWeight,
           height: profileForGuest.height,
           activityLevel: profileForGuest.activityLevel,
         } : undefined,