One Repo, Five Machines: Branch-per-Component in an IoT Build 一個儲存庫、五台機器：以分支切分 IoT 系統元件
A self-hosted AWS IoT Device Shadow clone where every component — Flask shadow, auth server, control room, ESP32 gateway — lives on its own Git branch, and a physical switch can always overrule the cloud. 自架版的 AWS IoT Device Shadow：Flask Shadow、認證伺服器、中控台、ESP32 閘道各自佔據一條 Git 分支，而實體開關永遠可以否決雲端。
