chore(standards): ARFA 1.3 V4.0 standardisation

- composer.json: add extra.arfa.level=1, funding (GitHub sponsors),
  support.docs/security/forum URLs, expand authors with role, expand
  keywords to 8 terms
- README.md: premium ARFA 1.3 rewrite — badge header with Psalm L1
  badge, problem/solution code, 4 real-world use cases (registration,
  nested API payload, CMS rich-text, Brazilian document formatting),
  all 33 rules reference table (7 categories), CI integration snippet,
  architecture ADR decision table, project stats, ecosystem table with
  validator/transformer/serializer, centered footer with Packagist badge

Author: walmir-silva