feat: migrate audit to query-lib schema objects

[abnegate]

Summary

Canonical continuation of utopia-php/audit#133 in packages/audit, following the approved move to the monorepo.

• Return typed Attribute and Index schema objects and use Collection for database setup.
• Adapt ClickHouse schema, DDL and encoding paths to value objects while preserving existing fields, indexes, null handling and tenant behavior.
• Require the genuine Database dev-feat-query-lib VCS branch without an inline alias; declare PDO MySQL and Swoole test extensions.
• Cover nullable logs, schema defaults and string filtering.

Verification

Both registry and linked modes passed:

• Unit: 22 tests, 106 assertions.
• E2E: 92 tests, 1,023 assertions, including MariaDB and ClickHouse.

Pint, PHPStan, Rector, Composer validation and monorepo validation passed.

Hosted CI and PR review remain pending. No package split, release, tag or merge has been performed.

[abnegate]

@greptile-apps review

[abnegate]

@greptileai review the current head 394aa7f. The September 4 request using the older bot handle did not start a review; this uses the currently documented trigger.