feat(server): add attachment ORM models and table provisioning

Adds 5 tables in the CargoTrace schema: attachment_category,
finished_goods_attachment, finished_goods_attachment_item,
finished_goods_attachment_location, finished_goods_box_attachment_item.
Includes a one-off create_all script and extends test cleanup.

Co-Authored-By: Claude <noreply@anthropic.com>

app/models/attachment.py

@@ -0,0 +1,142 @@
+from datetime import datetime
+
+from sqlalchemy import (
+    BigInteger,
+    Boolean,
+    DateTime,
+    Index,
+    Integer,
+    Numeric,
+    String,
+    func,
+)
+from sqlalchemy.orm import Mapped, mapped_column
+
+from app.core.database import Base
+
+SCHEMA = "CargoTrace"
+
+
+class AttachmentCategory(Base):
+    """附件类型字典。本期由业务方直接维护表数据，无管理界面。"""
+
+    __tablename__ = "attachment_category"
+    __table_args__ = ({"schema": SCHEMA},)
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    name: Mapped[str] = mapped_column(String(64), nullable=False, unique=True)
+    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    is_active: Mapped[bool] = mapped_column(Boolean, nullable=False, default=True)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+
+
+class FinishedGoodsAttachment(Base):
+    """订单级附件判定，每个总排号一行。"""
+
+    __tablename__ = "finished_goods_attachment"
+    __table_args__ = (
+        Index("uk_fga_zongpai_no", "zongpai_no", unique=True),
+        {"schema": SCHEMA},
+    )
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    zongpai_no: Mapped[str] = mapped_column(String(64), nullable=False)
+    # undetermined / none / has
+    determination: Mapped[str] = mapped_column(
+        String(16), nullable=False, default="undetermined"
+    )
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        onupdate=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+
+
+class FinishedGoodsAttachmentItem(Base):
+    """类型级计划明细：每个 总排号 × 类型 一行。已到数量由箱明细派生，不落库。"""
+
+    __tablename__ = "finished_goods_attachment_item"
+    __table_args__ = (
+        Index(
+            "uk_fgai_zongpai_category", "zongpai_no", "category_id", unique=True
+        ),
+        Index("idx_fgai_zongpai_no", "zongpai_no"),
+        {"schema": SCHEMA},
+    )
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    zongpai_no: Mapped[str] = mapped_column(String(64), nullable=False)
+    category_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    expected_qty: Mapped[int] = mapped_column(Integer, nullable=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+    updated_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        onupdate=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+
+
+class FinishedGoodsAttachmentLocation(Base):
+    """附件上架，镜像 finished_goods_location。每种类型一个货位。"""
+
+    __tablename__ = "finished_goods_attachment_location"
+    __table_args__ = (
+        Index(
+            "uk_fgal_zongpai_category", "zongpai_no", "category_id", unique=True
+        ),
+        {"schema": SCHEMA},
+    )
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    zongpai_no: Mapped[str] = mapped_column(String(64), nullable=False)
+    category_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    location_code: Mapped[str] = mapped_column(String(64), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )
+
+
+class FinishedGoodsBoxAttachmentItem(Base):
+    """附件装箱明细，共用 finished_goods_box（排产号级箱）。"""
+
+    __tablename__ = "finished_goods_box_attachment_item"
+    __table_args__ = (
+        Index("idx_fgbai_box_id", "box_id"),
+        Index("idx_fgbai_zongpai_category", "zongpai_no", "category_id"),
+        {"schema": SCHEMA},
+    )
+
+    id: Mapped[int] = mapped_column(BigInteger, primary_key=True, autoincrement=True)
+    box_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    zongpai_no: Mapped[str] = mapped_column(String(64), nullable=False)
+    category_id: Mapped[int] = mapped_column(BigInteger, nullable=False)
+    quantity: Mapped[float] = mapped_column(Numeric(18, 3), nullable=False)
+    created_at: Mapped[datetime] = mapped_column(
+        DateTime,
+        nullable=False,
+        default=func.current_timestamp(),
+        server_default=func.current_timestamp(),
+    )