初始提交：项目基础结构

- backend: FastAPI 后端服务 (Python)
- frontend: React + Tauri 前端应用
- docker-compose.yml: 容器编排配置

backend/app/models/product.py

@@ -0,0 +1,50 @@
+"""产品模型"""
+import uuid
+from datetime import datetime, timezone
+from sqlalchemy import String, DateTime, ForeignKey
+from sqlalchemy.dialects.postgresql import UUID
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.models.base import Base
+
+
+class Product(Base):
+    __tablename__ = "products"
+
+    id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), primary_key=True, default=uuid.uuid4,
+    )
+    serial_number: Mapped[str] = mapped_column(
+        String(16), unique=True, index=True, nullable=False, comment="产品序列号(16位)",
+    )
+
+    # ---- 物理外键（关联本库 production_orders） ----
+    order_id: Mapped[uuid.UUID] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("production_orders.id"), nullable=False, comment="所属订单ID",
+    )
+
+    # ---- 逻辑外键（关联老系统物料表，仅存储 ID，无物理约束） ----
+    material_id: Mapped[str | None] = mapped_column(
+        String(64), nullable=True, comment="物料ID(逻辑外键→老系统)",
+    )
+
+    # ---- 物理外键（自引用：父产品） ----
+    parent_product_id: Mapped[uuid.UUID | None] = mapped_column(
+        UUID(as_uuid=True), ForeignKey("products.id"), nullable=True, comment="父产品ID",
+    )
+
+    status: Mapped[str] = mapped_column(
+        String(50), nullable=False, default="pending", comment="产品状态",
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime(timezone=True), default=lambda: datetime.now(timezone.utc), comment="创建时间",
+    )
+
+    # ---- 关系 ----
+    order: Mapped["ProductionOrder"] = relationship("ProductionOrder", lazy="selectin")
+    parent_product: Mapped["Product | None"] = relationship(
+        "Product", remote_side="Product.id", lazy="selectin",
+    )
+
+    def __repr__(self) -> str:
+        return f"<Product {self.serial_number}>"