[hugoalves-dev]

Summary

• Switch runtime and Flyway dependencies/configuration to PostgreSQL and native UUIDs.
• Add a PostgreSQL migration history, GIN-backed assistant search, PostgreSQL Compose and load-test setup, and Testcontainers-backed integration/E2E database configuration.
• Document data migration, cutover, and rollback steps.

Closes #106

Validation

• Backend CI tests and package job passed on the current head.
• Qodana completed successfully.
• Production-data dry run and cutover remain operator steps and are documented in the README.

[github-actions]

Qodana for JVM

It seems all right 👌

No new problems were found according to the checks applied

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