feat: CoreDNS IPv4 上游、03-03 Tomcat 修复、HAProxy 与验证脚本

- Ansible: 部署时自动配置 CoreDNS forward 为 IPv4，避免 ACME 解析失败
- 01-01/01-07: 文档增加 CoreDNS 设置说明
- 03-03: Tomcat webapps.dist 复制、HTTP/HTTPS 双 Ingress、显式 Dashboard IngressRoute
- traefik-dashboard-acme: tomcat-acme.yaml、404 排查说明
- HAProxy: 健康检查与 PROXY 配置拆分，18080/18443 部署与验证脚本

Made-with: Cursor

ansible/files/traefik-dashboard-acme/traefik-dashboard-acme.yaml

@@ -44,6 +44,19 @@ spec:
     nodeSelector:
       kubernetes.io/hostname: ylc61
 
-    ingressRoute:
-      dashboard:
-        enabled: true
+---
+# 显式 IngressRoute（与 03-01 一致，确保 /dashboard 可达； Helm ingressRoute.dashboard 在 K3s chart 中未必生效）
+apiVersion: traefik.io/v1alpha1
+kind: IngressRoute
+metadata:
+  name: traefik-dashboard
+  namespace: kube-system
+spec:
+  entryPoints:
+    - web
+  routes:
+    - match: PathPrefix(`/dashboard`) || PathPrefix(`/api`)
+      kind: Rule
+      services:
+        - name: api@internal
+          kind: TraefikService