feat: add resource library and real image workflow

app/infra/db/models/library_resource_file.py

@@ -0,0 +1,37 @@
+"""Library resource file ORM model."""
+
+from __future__ import annotations
+
+from sqlalchemy import Enum, ForeignKey, Integer, String
+from sqlalchemy.orm import Mapped, mapped_column, relationship
+
+from app.domain.enums import LibraryFileRole
+from app.infra.db.base import Base, TimestampMixin
+
+
+class LibraryResourceFileORM(TimestampMixin, Base):
+    """Persisted uploaded file metadata for a library resource."""
+
+    __tablename__ = "library_resource_files"
+
+    id: Mapped[int] = mapped_column(Integer, primary_key=True, autoincrement=True)
+    resource_id: Mapped[int] = mapped_column(
+        ForeignKey("library_resources.id"),
+        nullable=False,
+        index=True,
+    )
+    file_role: Mapped[LibraryFileRole] = mapped_column(
+        Enum(LibraryFileRole, native_enum=False),
+        nullable=False,
+        index=True,
+    )
+    storage_key: Mapped[str] = mapped_column(String(500), nullable=False)
+    public_url: Mapped[str] = mapped_column(String(500), nullable=False)
+    bucket: Mapped[str] = mapped_column(String(255), nullable=False)
+    mime_type: Mapped[str] = mapped_column(String(255), nullable=False)
+    size_bytes: Mapped[int] = mapped_column(Integer, nullable=False)
+    sort_order: Mapped[int] = mapped_column(Integer, nullable=False, default=0)
+    width: Mapped[int | None] = mapped_column(Integer, nullable=True)
+    height: Mapped[int | None] = mapped_column(Integer, nullable=True)
+
+    resource = relationship("LibraryResourceORM", back_populates="files")