feat: 添加手机号、邀请好友、邮件通知功能

- 用户模型添加：手机号、邀请码、邀请统计、邮件通知设置
- 邀请好友系统：专属邀请码、邀请奖励（¥5/人）
- 邮件通知：翻译完成通知（含附件）、欢迎邮件、到期提醒
- 新增模型：UserInvitation, InviteRewardConfig, EmailNotification, EmailTemplateConfig
- 个人中心添加：手机号绑定、通知设置、邀请好友模块
- email_service.py：邮件发送服务（支持附件）

新用户注册奖励：¥2
邀请人奖励：¥5/人

app.py

@@ -15,7 +15,9 @@ from werkzeug.utils import secure_filename
 from config import *
 from models import (db, User, Translation, TranslationCache, GuestTranslation, 
                    DataPackage, UserPackage, DynamicConfig, UserRecharge, UserRefund,
-                   MembershipPurchase, AccountTransaction, MembershipPlanConfig, UserTypeConfig)
+                   MembershipPurchase, AccountTransaction, MembershipPlanConfig, UserTypeConfig,
+                   UserInvitation, InviteRewardConfig, EmailNotification, EmailTemplateConfig)
+from email_service import email_service
 from services import TranslationService, CacheService, TranslationTask
 from admin import admin_bp
 
@@ -591,12 +593,15 @@ def login():
 def register():
     """注册"""
     if request.method == 'GET':
-        return render_template('register.html')
+        # 检查邀请码参数
+        invite_code = request.args.get('invite', None)
+        return render_template('register.html', invite_code=invite_code)
     
     data = request.json
     username = data.get('username')
     email = data.get('email')
     password = data.get('password')
+    invite_code = data.get('invite_code', None)  # 邀请码
     
     # 检查用户是否存在
     if User.query.filter_by(username=username).first():
@@ -608,11 +613,76 @@ def register():
     # 创建用户
     user = User(username=username, email=email, user_type='free')
     user.set_password(password)
+    
+    # 生成邀请码（6位随机字符）
+    import random
+    import string
+    user.invite_code = ''.join(random.choices(string.ascii_uppercase + string.digits, k=6))
+    
+    # 处理邀请
+    if invite_code:
+        inviter = User.query.filter_by(invite_code=invite_code).first()
+        if inviter:
+            user.invited_by = inviter.id
+            
+            # 创建邀请记录
+            invitation = UserInvitation(
+                inviter_id=inviter.id,
+                invite_code=invite_code,
+                invitee_id=user.id,
+                invitee_email=email,
+                reward_amount=5.0,
+                status='registered',
+                registered_at=datetime.utcnow()
+            )
+            db.session.add(invitation)
+            
+            # 给邀请人奖励
+            inviter.invite_count += 1
+            inviter.invite_rewards += 5.0
+            inviter.balance += 5.0
+            
+            # 给被邀请人奖励
+            user.balance += 2.0
+            
+            # 创建流水
+            inviter_tx = AccountTransaction(
+                user_id=inviter.id,
+                transaction_type='invite_reward',
+                amount=5.0,
+                balance_before=inviter.balance - 5.0,
+                balance_after=inviter.balance,
+                description=f'邀请用户{username}注册奖励'
+            )
+            db.session.add(inviter_tx)
+            
+            user_tx = AccountTransaction(
+                user_id=user.id,
+                transaction_type='invite_bonus',
+                amount=2.0,
+                balance_before=0,
+                balance_after=2.0,
+                description='新用户注册奖励'
+            )
+            db.session.add(user_tx)
+            
+            # 发送邀请奖励邮件
+            if inviter.email_notify:
+                email_service.send_invite_reward(inviter.email, inviter.username, 5.0, inviter.invite_count)
+    
     db.session.add(user)
     db.session.commit()
     
     session['user_id'] = user.id
-    return jsonify({'success': True, 'user': user.to_dict()})
+    
+    # 发送欢迎邮件
+    email_service.send_welcome_email(user.email, user.username, user.invite_code)
+    
+    return jsonify({
+        'success': True, 
+        'user': user.to_dict(),
+        'invite_reward': user.balance > 0  # 是否获得邀请奖励
+    })
 
 
 @app.route('/logout')
@@ -775,6 +845,68 @@ def request_refund():
     })
 
 
+@app.route('/api/profile/settings', methods=['POST'])
+def update_settings():
+    """更新账户设置"""
+    user = get_current_user()
+    if not user:
+        return jsonify({'error': '请登录'}), 401
+    
+    data = request.json
+    
+    # 手机号
+    if 'phone' in data:
+        phone = data.get('phone', '')
+        if phone and len(phone) >= 10:
+            user.phone = phone
+            user.phone_verified = False
+    
+    # 通知设置
+    if 'notify_on_complete' in data:
+        user.notify_on_complete = data.get('notify_on_complete', True)
+    if 'notify_on_expire' in data:
+        user.notify_on_expire = data.get('notify_on_expire', True)
+    if 'email_notify' in data:
+        user.email_notify = data.get('email_notify', True)
+    
+    db.session.commit()
+    
+    return jsonify({
+        'success': True,
+        'user': user.to_dict()
+    })
+
+
+@app.route('/api/profile/invitations')
+def get_invitations():
+    """获取邀请记录"""
+    user = get_current_user()
+    if not user:
+        return jsonify({'error': '请登录'}), 401
+    
+    invitations = UserInvitation.query.filter_by(inviter_id=user.id)\
+        .order_by(UserInvitation.created_at.desc()).limit(20).all()
+    
+    return jsonify({
+        'success': True,
+        'invitations': [inv.to_dict() for inv in invitations]
+    })
+
+
+@app.route('/api/invite/<invite_code>')
+def check_invite(invite_code):
+    """检查邀请码"""
+    inviter = User.query.filter_by(invite_code=invite_code).first()
+    if not inviter:
+        return jsonify({'valid': False, 'error': '邀请码无效'})
+    
+    return jsonify({
+        'valid': True,
+        'inviter': inviter.username,
+        'reward': 5  # 被邀请人奖励
+    })
+
+
 # ==================== 初始化 ====================
 def init_app():
     """初始化应用"""