v1.2.1 — MySQL DBAL Stabilization + DSN Parsing Fixes + CI Compatibility

This release delivers full stability for MySQL DBAL connections across all environments,
including GitHub Actions, Docker, and bare-metal servers.

It resolves the long-standing socket fallback issue, improves DSN parsing for complex
passwords, and ensures consistent behavior between PDO and Doctrine DBAL modes.

All RawAccess tests now pass reliably.