feat: simplify relationship definitions for FaLineItem in ORM models

backend/main.py

@@ -23,6 +23,8 @@ from fastapi.staticfiles import StaticFiles
 from pathlib import Path
 
 # Importar modelos para registrar con SQLAlchemy
+# IMPORTANT: Import FaLineItem BEFORE LineItem for relationship resolution
+from api.v1.modules.a24.fa.fa_item_lines.models import FaLineItem
 from api.v1.modules.a76.items.models import LineItem
 from api.v1.modules.a76.items.series.models import Serie
 from api.v1.modules.a76.parts.models import Part
@@ -83,6 +85,7 @@ async def on_startup():
     run_migrations()
     logger.info("Base de datos inicializada correctamente.")
 
+
 # Configurar CORS
 app.add_middleware(
     CORSMiddleware,