Add k3s cluster expansion documentation and scripts

- Complete expansion guide for 2/4/6 node scenarios
- Quick join scripts for worker and master nodes
- Health check and diagnostic scripts
- Quick reference card for common operations

k3s/argocd-ingress.yaml

@@ -6,8 +6,8 @@ metadata:
   annotations:
     cert-manager.io/cluster-issuer: letsencrypt-prod
     traefik.ingress.kubernetes.io/router.entrypoints: websecure
-    nginx.ingress.kubernetes.io/ssl-passthrough: "true"
-    nginx.ingress.kubernetes.io/backend-protocol: "HTTPS"
+    traefik.ingress.kubernetes.io/service.serversscheme: https
+    traefik.ingress.kubernetes.io/service.serverstransport: insecure@file
 spec:
   tls:
   - hosts: