Restrict public access to Offering modification endpoints (CREATE, UPDATE, DELETE)

[juanrasantana]

To secure Offering data, restrict access to certain endpoints. Specifically, endpoints for modifying Offerings (CREATE, UPDATE, DELETE) should be accessible only by the data provider, while read-only endpoints (GET, Self-Listing) should remain publicly accessible. Implement access restrictions, such as through an inverse proxy (e.g., Traefik), to allow only localhost access for the sensitive ones.