Introduced a robust database seeding script with bcrypt password hashing and test user data, along with SEEDING.md documentation. Updated Dockerfile for improved Python environment setup. Enhanced health check endpoint to report missing external API configurations. Added docker-compose.infra.dev.yml for local infrastructure, clarified environment variable usage, and improved developer onboarding in README and env.example. New npm scripts for seeding and resetting the database. Minor code comments and translation improvements for clarity.