Update ISO installer tiers and backend deployment

ansible/phase1_nvidia.yml

@@ -1,6 +1,6 @@
 ---
 # Phase 1: NVIDIA drivers only. Server reboots after this.
-- name: Cezen AI — Phase 1 NVIDIA Drivers
+- name: Nexus One AI — Phase 1 NVIDIA Drivers
   hosts: localhost
   connection: local
   become: true