fix: use literal values in .env.example and correct env var name in alembic (#77)
.env files don't support shell variable interpolation, so DATABASE_URL
and REDIS_URL had literal ${VAR} strings instead of actual values.
Also alembic/env.py read SQLALCHEMY_DATABASE_URL instead of DATABASE_URL.
Closes #62
Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>
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