Add Ingress page with diagram - New Ingress.md (FR): L7 routing (host/path), the Ingress Controller is the engine, why over NodePort/LoadBalancer, pathType, TLS/cert-manager, manifest, Gateway API note, Service vs Ingress, kubectl commands - New images/ingress.svg (Client -> Ingress -> Services -> Pods) - Add page to Home and _Sidebar; update AGENTS.md page list