Configure ArgoCD for private repo access

- Update repo URLs from HTTPS placeholder to git@github.com:lazorgurl/homelab.git
- Update container image refs from OWNER to lazorgurl
- Set KUBECONFIG env in Taskfile
- Fix kubeconfig-fetch.sh to auto-detect server IP from inventory
- Fix Ansible: callback plugin, br_netfilter ordering, ssh service name

infra/kubernetes/argocd/app-of-apps.yaml

@@ -8,7 +8,7 @@ metadata:
 spec:
   project: default
   source:
-    repoURL: https://github.com/OWNER/homelab.git
+    repoURL: git@github.com:lazorgurl/homelab.git
     targetRevision: main
     path: infra/kubernetes/argocd
   destination: