refactor: update AS entry handling in API and database to support ASN-only entries. Remove prefix field from AS entry structure and adjust related functions and tests. Enhance OpenAPI specifications and documentation to reflect changes in AS entry representation.

internal/repository/postgres.go

@@ -830,7 +830,7 @@ func (p *Postgres) CreateRenderRevision(revisionID, tenantID, moduleID string, p
 		}
 		_, err = tx.Exec(ctx, `
 			INSERT INTO revision_materialized_prefix (revision_id, prefix, community_id, source)
-			VALUES ($1::uuid, $2::cidr, $3::uuid, $4)`,
+			VALUES ($1::uuid, $2, $3::uuid, $4)`,
 			strings.TrimSpace(revisionID), strings.TrimSpace(pr.Prefix), comm, src)
 		if err != nil {
 			return err