hosts: add monitoring02 configuration

New test-tier host for monitoring stack expansion with:
- Static IP 10.69.13.24
- 4 CPU cores, 4GB RAM, 20GB disk
- Vault integration and NATS-based deployment enabled

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

hosts/monitoring02/default.nix

@@ -0,0 +1,5 @@
+{ ... }: {
+  imports = [
+    ./configuration.nix
+  ];
+}