Add Docker Compose for Local Development Environment

[carlos-israelj]

Description

No standardized local development environment. New developers must manually install PostgreSQL, Redis, and configure environment variables, causing onboarding friction.

Current State

Manual installation required.

Problems

• Long onboarding time (2-3 hours)
• Version mismatches (Postgres 14 vs 15)
• Environment configuration errors
• Difficult to reproduce production issues locally

Proposed Solution

Docker Compose with all services (PostgreSQL, Redis, backend, frontend).

Acceptance Criteria

• docker-compose.yml with all services
• One command to start: docker-compose up
• Hot reload for development
• Seeded database with test data
• Environment variables in .env.example
• README updated with setup instructions
• <2 minutes to get running

ETA

2-3 days