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/appsets/apps.yaml

@@ -8,7 +8,7 @@ spec:
   goTemplateOptions: ["missingkey=error"]
   generators:
     - git:
-        repoURL: https://github.com/OWNER/homelab.git
+        repoURL: git@github.com:lazorgurl/homelab.git
         revision: main
         directories:
           - path: apps/*/k8s/overlays/production
@@ -18,7 +18,7 @@ spec:
     spec:
       project: default
       source:
-        repoURL: https://github.com/OWNER/homelab.git
+        repoURL: git@github.com:lazorgurl/homelab.git
         targetRevision: main
         path: "{{ .path.path }}"
       destination: