Initial commit: TradeMate 外贸小助手 MVP

项目结构:
- backend/     Python FastAPI 后端
- uni-app/     uni-app跨端前端
- docs/        设计文档
- docker-compose.yml  Docker编排
- nginx/scripts/systemd 运维配置

已完成功能:
- 用户认证 (JWT)
- 智能翻译 + 回复建议
- 营销素材生成
- 客户管理 + 沉默检测
- 报价单管理
- 产品库管理
- 汇率换算
- 推送通知 (uni-push)
- WhatsApp Webhook框架
- Celery定时任务

backend/app/models/user.py

@@ -0,0 +1,54 @@
+from sqlalchemy import Column, String, Boolean, Integer, DateTime, Text
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+from sqlalchemy.orm import relationship
+from datetime import datetime
+from app.database import Base
+import uuid
+
+
+class User(Base):
+    __tablename__ = "users"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    wechat_openid = Column(String(255), unique=True, index=True)
+    phone = Column(String(20), unique=True, index=True)
+    username = Column(String(100))
+    password_hash = Column(String(255))
+    tier = Column(String(50), default="free")
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+    settings = Column(JSONB, default={
+        "preferred_translate_provider": "auto",
+        "reply_tone": "professional",
+        "timezone": "Asia/Shanghai",
+        "languages": ["zh", "en"],
+    })
+
+    products = relationship("Product", back_populates="user", cascade="all, delete-orphan")
+    customers = relationship("Customer", back_populates="user", cascade="all, delete-orphan")
+    conversations = relationship("Conversation", back_populates="user", cascade="all, delete-orphan")
+    quotations = relationship("Quotation", back_populates="user", cascade="all, delete-orphan")
+
+
+class Product(Base):
+    __tablename__ = "products"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id = Column(UUID(as_uuid=True), nullable=False, index=True)
+    name = Column(String(255), nullable=False)
+    name_en = Column(String(255))
+    description = Column(Text)
+    description_en = Column(Text)
+    category = Column(String(100))
+    price = Column(String(50))
+    price_unit = Column(String(20), default="USD")
+    moq = Column(String(50))
+    keywords = Column(JSONB, default=[])
+    specifications = Column(JSONB, default={})
+    images = Column(JSONB, default=[])
+    is_active = Column(Boolean, default=True)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    user = relationship("User", back_populates="products")