feat(business): 新增业务数据七表及 V5 迁移（业务/明细/状态留痕/发货/回款/评级配置）

- businesses 五项汇总冗余列服务层事务内维护；毛利润不落库（派生值，M3 台账固化） - 行级 product_category 折算锚点（#14）；回款 settlement_status 预置为 M3 防重锚点 - 评级等级种子四条（迁移+init-dev 双写）；编号前缀常量 YW/SH/HK - 双轨 SQL 同步（V4/V5 重导，schema_sync+test_models 164 例全绿） Co-Authored-By: Claude Code <noreply@anthropic.com>
2026-10-13 11:22:34 +08:00
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+"""发货模型：发货单与发货产品明细。
+
+- ship_date 是**回款天数计算基准日**（对照表 #1：发货日首日计第 1 天），
+  回款指定本发货单后由 formula.payment_days 派生回款天数，不在本表落库
+- 运费仅记录展示，不计入毛利润口径（对照表 #2）
+- total_amount 为明细行汇总冗余，服务层事务内维护
+"""
+
+from datetime import date
+from decimal import Decimal
+
+from sqlalchemy import Date, ForeignKey, Index, Numeric, String
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.models.base import (
+    BIGINT_UNSIGNED,
+    Base,
+    TimestampMixin,
+    TPlusSyncMixin,
+    mysql_table_args,
+)
+
+
+class Shipment(Base, TimestampMixin, TPlusSyncMixin):
+    """发货单表（需求 2.2.2）：每笔发货对应一个业务，支持分批发货。"""
+
+    __tablename__ = "shipments"
+    __table_args__ = mysql_table_args(
+        "发货单表（发货日为回款天数基准日，发货日首日计第 1 天）",
+        Index("idx_shipments_business_id", "business_id"),
+        Index("idx_shipments_ship_date", "ship_date"),
+    )
+
+    id: Mapped[int] = mapped_column(
+        BIGINT_UNSIGNED, primary_key=True, autoincrement=True, comment="主键ID"
+    )
+    shipment_no: Mapped[str] = mapped_column(
+        String(32),
+        nullable=False,
+        unique=True,
+        comment="发货单号，自动生成 SH{YYYYMMDD}-{4位当日序号}（内部追溯用）",
+    )
+    business_id: Mapped[int] = mapped_column(
+        BIGINT_UNSIGNED,
+        ForeignKey("businesses.id", ondelete="RESTRICT"),
+        nullable=False,
+        comment="业务ID（businesses.id；终态业务禁止新发货）",
+    )
+    ship_date: Mapped[date] = mapped_column(
+        Date, nullable=False, comment="发货日期（回款天数基准日，发货日首日=第 1 天）"
+    )
+    freight_amount: Mapped[Decimal] = mapped_column(
+        Numeric(14, 2),
+        nullable=False,
+        server_default="0",
+        comment="运费金额（仅记录展示；不计入毛利润口径，对照表 #2）",
+    )
+    total_amount: Mapped[Decimal] = mapped_column(
+        Numeric(14, 2),
+        nullable=False,
+        server_default="0",
+        comment="发货总金额（明细行汇总冗余，服务层事务内维护，禁手工直改）",
+    )
+    remark: Mapped[str | None] = mapped_column(String(255), comment="备注")
+
+
+class ShipmentItem(Base, TimestampMixin):
+    """发货产品明细表（需求 2.2.2）：记录发货的产品名称、规格、数量等。
+
+    价格口径两可（T+ 供价或人工录入，待 IT 确认）：sale_price 可空人工补，
+    amount 由服务层按 数量×单价 计算固化。
+    """
+
+    __tablename__ = "shipment_items"
+    __table_args__ = mysql_table_args(
+        "发货产品明细表",
+        Index("idx_shipment_items_shipment_id", "shipment_id"),
+        Index("idx_shipment_items_product_id", "product_id"),
+    )
+
+    id: Mapped[int] = mapped_column(
+        BIGINT_UNSIGNED, primary_key=True, autoincrement=True, comment="主键ID"
+    )
+    shipment_id: Mapped[int] = mapped_column(
+        BIGINT_UNSIGNED,
+        ForeignKey("shipments.id", ondelete="RESTRICT"),
+        nullable=False,
+        comment="发货单ID（shipments.id）",
+    )
+    product_id: Mapped[int | None] = mapped_column(
+        BIGINT_UNSIGNED,
+        ForeignKey("products.id", ondelete="RESTRICT"),
+        comment="产品ID（products.id；NULL=自由录入）",
+    )
+    product_name: Mapped[str] = mapped_column(
+        String(128), nullable=False, comment="产品名称（引用产品时冗余固化）"
+    )
+    spec_model: Mapped[str] = mapped_column(
+        String(128),
+        nullable=False,
+        server_default="''",
+        comment="规格型号（冗余固化；空串对齐 products 组合唯一键口径）",
+    )
+    unit: Mapped[str | None] = mapped_column(String(16), comment="计量单位")
+    quantity: Mapped[Decimal] = mapped_column(
+        Numeric(14, 2), nullable=False, comment="发货数量（>0）"
+    )
+    sale_price: Mapped[Decimal | None] = mapped_column(
+        Numeric(14, 4), comment="发货单价（元；T+ 同步或人工，口径待 IT 确认）"
+    )
+    amount: Mapped[Decimal] = mapped_column(
+        Numeric(14, 2),
+        nullable=False,
+        comment="行金额 = 数量×单价（服务层计算固化，不信任前端传值）",
+    )