One Build, Every Environment: Runtime Config Transforms Frontend Deployment

This tool addresses a fundamental inefficiency in frontend deployment where applications must be rebuilt for each environment due to build-time environment variables. By enabling runtime configuration injection, it realizes the long-sought 'build once, deploy everywhere' model that strengthens DevOps practices, reduces deployment complexity, minimizes drift, and enforces immutable artifact principles. This represents a significant maturation of frontend tooling toward production-grade deployment discipline.