fix: Re-add HTTPS port to Tailscale LB for Rancher

Rancher now manages its own TLS (no longer tls:external), so it serves
HTTPS on port 443. The Tailscale LoadBalancer needs to expose both
HTTP (80) and HTTPS (443) targeting the corresponding container ports.

infrastructure/addons/rancher/rancher-tailscale-service.yaml

@@ -16,3 +16,7 @@ spec:
       port: 80
       protocol: TCP
       targetPort: 80
+    - name: https
+      port: 443
+      protocol: TCP
+      targetPort: 443