feat: 新增产品生命周期阶段字段lifecycle_phase与售后工序词表

backend/app/models/product.py

@@ -7,6 +7,7 @@ from sqlalchemy.orm import Mapped, mapped_column, relationship
 
 from app.models.base import Base
 from app.core.time_utils import get_beijing_time
+from app.core.lifecycle import LIFECYCLE_PRODUCTION
 
 
 class Product(Base):
@@ -64,6 +65,13 @@ class Product(Base):
     overall_status: Mapped[str | None] = mapped_column(
         String(20), nullable=True, comment="宏观状态: 备货/生产/测试/维修/待仓库收货/已入库/已出库",
     )
+    # 生命周期阶段 — 生产制造 vs 出库后返厂售后。
+    # 设备出库后再次被派发任务 = 回流返厂，此处切为 AFTER_SALES 且不再回退。
+    lifecycle_phase: Mapped[str] = mapped_column(
+        String(20), nullable=False, default=LIFECYCLE_PRODUCTION,
+        server_default=LIFECYCLE_PRODUCTION, index=True,
+        comment="生命周期阶段: PRODUCTION(生产制造) | AFTER_SALES(出库后返厂售后)",
+    )
     created_at: Mapped[datetime] = mapped_column(
         DateTime(timezone=True), default=get_beijing_time, comment="创建时间",
     )