docs: update documentation for async database connections

fix(migrations): update sqlalchemy url for alembic

build: update docker entrypoint

docs: add error resolution guide

build: update alembic config to use psycopg

fix(db): update database connection settings

feat(ci): add docker entrypoint script

build: update dependencies and database config

docs: add testing strategy and new endpoint workflow documentation

docs: add documentation for clean architecture and ddd patterns

docs(api): add API documentation for users endpoints

docs: add environment variables documentation

docs: add docker deployment and local setup documentation

docs: update README with project documentation

feat: initialize project with docker and alembic