refactor: move migrations directory under db and update paths in compose.yaml and ci.yml

refactor: major refactor of settings management and DB initialization for operational consistency

use flyway cli download and cache

add flyway db migration with alembic sql generation

alembic init

uv add alembic

sonarqube report and code fix

uv package upgrade

replace docker compose with service containers

uv upgrade packages

add playwright E2E tests

fix app in docker compose

add pre-commit

add github actions ci workflow

use async db connection for postgres and sqlite