Go backend development setup - Day 1/60 60 Day Go Backend Engineering Challenge

Description

Day 1 of the 60 Day Go Backend Engineering Challenge. Today covers go backend development setup with a focus on building a Go backend workspace that makes services easy to run, test, and evolve. Topics: - keep the module layout simple enough that handlers, services, and storage code do not bleed together - use go run, go test, and a small local config path as part of the feedback loop instead of as afterthoughts - treat tooling choices as part of the service design because they compound over 60 days