feat(topics): migrate produce record page to UI registry

Replace legacy @redpanda-data/ui components with Registry equivalents
(Field, Select, Input, Button, Alert, typography) and react-hook-form +
Zod validation. Use standardized KeyValueField for Kafka headers. Convert
the PageComponent class to a functional component using setPageHeader and
useApiStoreHook for store reactivity.

Author: jvorcak