Initial commit with Phase 0 Scaffolding

backend/app/models/__init__.py

@@ -0,0 +1,13 @@
+"""
+SQLAlchemy models for PaperJet.
+
+All models use UUIDv4 string primary keys (except the singleton settings row).
+Timestamps are stored as ISO8601 TEXT columns.
+"""
+
+from app.models.settings import Settings
+from app.models.document import Document
+from app.models.annotation_state import AnnotationState
+from app.models.version import Version
+
+__all__ = ["Settings", "Document", "AnnotationState", "Version"]