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/quotation.py

@@ -0,0 +1,50 @@
+from sqlalchemy import Column, String, Boolean, Integer, DateTime, Text, ForeignKey, Float
+from sqlalchemy.dialects.postgresql import UUID, JSONB
+from sqlalchemy.orm import relationship
+from datetime import datetime
+from app.database import Base
+import uuid
+
+
+class Quotation(Base):
+    __tablename__ = "quotations"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    user_id = Column(UUID(as_uuid=True), nullable=False, index=True)
+    customer_id = Column(UUID(as_uuid=True), ForeignKey("customers.id"), nullable=False)
+    title = Column(String(255))
+    status = Column(String(50), default="draft")
+    currency = Column(String(10), default="USD")
+    exchange_rate = Column(Float)
+    payment_terms = Column(String(255))
+    delivery_terms = Column(String(255))
+    lead_time = Column(String(100))
+    valid_until = Column(String(100))
+    subtotal = Column(Float)
+    discount = Column(Float, default=0)
+    shipping = Column(Float, default=0)
+    total = Column(Float)
+    notes = Column(Text)
+    pdf_url = Column(Text)
+    sent_at = Column(DateTime)
+    created_at = Column(DateTime, default=datetime.utcnow)
+    updated_at = Column(DateTime, default=datetime.utcnow, onupdate=datetime.utcnow)
+
+    user = relationship("User", back_populates="quotations")
+    customer = relationship("Customer", back_populates="quotations")
+    items = relationship("QuotationItem", back_populates="quotation", cascade="all, delete-orphan")
+
+
+class QuotationItem(Base):
+    __tablename__ = "quotation_items"
+
+    id = Column(UUID(as_uuid=True), primary_key=True, default=uuid.uuid4)
+    quotation_id = Column(UUID(as_uuid=True), ForeignKey("quotations.id"), nullable=False, index=True)
+    product_name = Column(String(255), nullable=False)
+    description = Column(Text)
+    quantity = Column(Integer, nullable=False)
+    unit_price = Column(Float, nullable=False)
+    total_price = Column(Float)
+    unit = Column(String(50), default="pcs")
+
+    quotation = relationship("Quotation", back_populates="items")