feat: support date profile fields

[vitormattos]

Summary

• add the new date field type to backend validation, normalization, workflow support, and API schemas
• render native date inputs in admin and personal editing flows
• add PHP and Vue regression coverage for the new date behavior

Validation

• npm run ts:check
• npm run test
• docker compose exec -u www-data -w /var/www/html/apps-extra/profile_fields nextcloud ./vendor/bin/phpunit -c tests/php/phpunit.xml --testsuite Unit --no-coverage --colors=always --fail-on-warning --fail-on-risky --display-deprecations --display-phpunit-deprecations --filter '''FieldDefinitionValidatorTest|FieldValueServiceTest|UserProfileFieldCheckTest''''
• docker compose exec -u www-data -w /var/www/html/apps-extra/profile_fields nextcloud composer cs:fix
• docker compose exec -u www-data -w /var/www/html/apps-extra/profile_fields nextcloud composer psalm

Evidence

Admin field creation

Personal settings