docs: add profiling section to README

[mikenairn]

Summary

Adds a Profiling section to the README documenting how to connect to the existing pprof endpoint for runtime CPU and memory profiling.

The dns-operator already has pprof enabled by default on :8082 — this PR just adds the documentation.

Motivation

pprof is the standard mechanism for diagnosing performance issues in Go applications. The Kubernetes kube-apiserver enables profiling via --profiling (default: true), exposing the same /debug/pprof/ endpoints. While dns-operator already has the pprof endpoint, there was no documentation on how to use it.

Changes

• Added ## Profiling section to README.md with kubectl port-forward and go tool pprof usage examples

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