hosts: add role metadata to all hosts

Assign roles to hosts for better organization and filtering:
- ha1: home-automation
- monitoring01, monitoring02: monitoring
- jelly01: media
- nats1: messaging
- http-proxy: proxy
- testvm01-03: test

Also promote kanidm01 and monitoring02 from test to prod tier.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

hosts/monitoring02/configuration.nix

@@ -13,9 +13,9 @@
     ../../common/vm
   ];
 
-  # Host metadata (adjust as needed)
   homelab.host = {
-    tier = "test";  # Start in test tier, move to prod after validation
+    tier = "prod";
+    role = "monitoring";
   };
 
   # DNS CNAME for Grafana test instance