feat: update ansible playbooks for openclaw VM configuration

- Add agentmon_ingest_url var to openclaw_servers inventory
- Reduce vm.swappiness from 10 to 5 for better memory management
- Refactor virtiofs mounts: remove bindfs layer, mount swarm-common
  directly at /mnt/swarm-common (simpler, no FUSE overhead)

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

ansible/inventory.yml

@@ -1,6 +1,8 @@
 all:
   children:
     openclaw_servers:
+      vars:
+        agentmon_ingest_url: "http://192.168.122.1:8080"
       hosts:
         zap:
           ansible_host: 192.168.122.182