fix(backend): seed.py add __main__ + seed_demo for demo tenant creation

backend/app/db/seed.py

@@ -70,6 +70,21 @@ PRETURI = [
 ]
 
 
+async def seed_demo(db: AsyncSession) -> None:
+    from app.auth.service import register
+    from sqlalchemy import select
+    from app.db.models.user import User
+
+    r = await db.execute(select(User).where(User.email == "demo@roaauto.ro"))
+    if r.scalar_one_or_none():
+        print("Demo user already exists.")
+        return
+    user, tenant = await register(db, "demo@roaauto.ro", "demo123", "ROA AUTO Demo", "0722000000")
+    print(f"Created demo tenant: {tenant.id}, user: {user.email}")
+    counts = await seed_catalog(db, tenant.id)
+    print(f"Seeded catalog: {counts}")
+
+
 async def seed_catalog(db: AsyncSession, tenant_id: str) -> dict:
     now = datetime.now(UTC).isoformat()
     counts = {}
@@ -117,3 +132,19 @@ async def seed_catalog(db: AsyncSession, tenant_id: str) -> dict:
 
     await db.commit()
     return counts
+
+
+if __name__ == "__main__":
+    import asyncio
+    from sqlalchemy.ext.asyncio import create_async_engine, async_sessionmaker
+    from app.config import settings
+    import app.db.models  # noqa
+
+    async def main():
+        engine = create_async_engine(settings.DATABASE_URL)
+        Session = async_sessionmaker(engine, expire_on_commit=False)
+        async with Session() as db:
+            await seed_demo(db)
+        await engine.dispose()
+
+    asyncio.run(main())