strip for CORS origins

new behavior adds trailing `/` to end of links without a path:

pydantic/pydantic#7186 (comment)

Author: swelborn

backend/app/app/main.py

@@ -34,7 +34,7 @@ async def shutdown_event():
 if settings.BACKEND_CORS_ORIGINS:
     app.add_middleware(
         CORSMiddleware,
-        allow_origins=[str(origin) for origin in settings.BACKEND_CORS_ORIGINS],
+        allow_origins=[str(origin).rstrip("/") for origin in settings.BACKEND_CORS_ORIGINS],
         allow_credentials=True,
         allow_methods=["*"],
         allow_headers=["*"],