4.0.0-M3

• upgraded to spring-boot 4.1 / jackson 3 (tools.jackson) + springdoc 4
• switched error responses to problem details (RFC 9457) - message renamed to detail, content-type application/problem+json
• zod: allow configure inferred types export + suffix
• un-deprecated BadRequestException - stays first-class
• removed tsid-creator dependency (hypersistence-tsid only)
• new docs site: https://commons-rest.rocketbase.io