Add Monero playbook; Shkeeper reaches monerod in-cluster

monero.yaml deploys the new ericomeehan.monero role (monerod + P2Pool on
nano, RPC login in a Secret). The Shkeeper bump points its Monero module at
the in-cluster monerod so XMR stops showing as Offline.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

monero.yaml

@@ -0,0 +1,8 @@
+- name: Deploy Monero and P2Pool
+  hosts: alpha-control-plane
+  become: true
+  vars_files:
+    - ../secrets.yaml
+  roles:
+    # monerod_user, monerod_password and monero_p2pool_wallet_address come from Vault.
+    - role: ericomeehan.monero