[chillwur]

Problem

The backend's .env.example documents DATABASE_URL and REDIS_URL, but there was no local way to stand up those services. As a result, apps/backend/src/services/stellar.ts falls back to an in-memory Map for wallet storage, since there's nowhere to persist to. This blocks backend work on wallets, transaction history, and conversation state, and forces contributors to depend on a cloud database just to develop locally.

Solution

• Added a docker-compose.yml at the repo root defining postgres:16 and redis:7 services, with credentials matching the defaults already documented in apps/backend/.env.example (hashport/hashport/hashport for Postgres, no-auth Redis on the default port).
• Both services use named volumes (postgres-data, redis-data) so data survives container restarts.
• Both services have health checks (pg_isready for Postgres, redis-cli ping for Redis) so docker compose up reports readiness.
• Added root package.json scripts: pnpm dev:infra (starts the containers in the background) and pnpm dev:infra:down (stops them).
• Updated CONTRIBUTING.md's Setup section to include the pnpm dev:infra step and a note that the example env vars already match the compose defaults.

closes #1