Upgrade to byjg/micro-orm 7.0 and anydataset-db 7.0

[byjg]

Summary

Upgrades the persistence stack to byjg/micro-orm 7.0 (which requires byjg/anydataset-db 7.0). The AuthUser public API is unchanged — since 6.0 the library was already wired exclusively through DatabaseExecutor, the API that became mandatory in anydataset-db 7.0.

Changes

• Bump byjg/micro-orm to ^7.0 (resolves 7.0.x-dev until the upstream 7.0.0 tags exist)
• Migrate test DDL from the removed $dbDriver->execute() to DatabaseExecutor::using() (4 test files)
• Replace deprecated Factory::getDbRelationalInstance with Factory::getDbInstance
• Update dev dependencies: phpunit ^12.5, psalm ^6.13
• Add CHANGELOG-7.0.md

Not affected

• src/ — no code changes needed (no observers, no Repository subclassing, already on DatabaseExecutor)
• docs/ — examples already show the DatabaseExecutor::using() wiring

Test plan

• vendor/bin/psalm — no errors
• vendor/bin/phpunit — 167 tests, 2318 assertions, all passing (PHP 8.5.7, phpunit 12.5)

Note: tag 7.0.0 only after micro-orm and anydataset-db publish their 7.0.0 tags, otherwise the stable release resolves against dev branches.