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/my-blog/03-ingress.yaml

@@ -9,6 +9,9 @@ metadata:
   annotations:
     # ▼▼▼ 关键注解：我要申请证书 ▼▼▼
     cert-manager.io/cluster-issuer: letsencrypt-prod
+    # ▼▼▼ Traefik sticky session 配置 ▼▼▼
+    traefik.ingress.kubernetes.io/affinity: "true"
+    traefik.ingress.kubernetes.io/session-cookie-name: "wordpress-session"
 spec:
   rules:
   - host: blog.u9.net3w.com  # 您的域名