caravel/backend/spec/main.md

async fn main() -> Result<()>

• Loads .env (via dotenvy) and configures tracing/logging from the default env filter
• Calls Env::load() to read and validate all configuration
• Calls create_pool(&env.database_url) to get a SqlitePool
• Constructs the services, passing &env where needed:
  • Robot::new(&env).await (publishes the robot's nostr identity)
  • Stripe::new(&env)
  • Query::new(pool.clone(), &env)
  • Command::new(pool)
  • Billing::new(query.clone(), command.clone(), &env)
  • Infra::new(query.clone(), command.clone(), &env)
  • Api::new(query, command, billing.clone(), stripe, robot, infra.clone(), &env)
• Builds a CORS layer restricted to the parsed env.server_allow_origins
• Gets the axum router from api.router() and applies the CORS layer
• Spawns infra.start() and billing.start() as background tasks
• Binds a TcpListener on env.server_host:env.server_port and calls axum::serve