feat: add team editor access and email OTP authentication for shared video & thumbnail management

fix(deploy): scale API rate limit for 50-60+ concurrent users and switch Dockerfile to lightweight Alpine for instant Railway deployment

feat: 5x backend speed & reliability upgrade (SQLite WAL storage, concurrent uploads, stream tuning, in-memory cache, auto-retry, quota auto-scheduling & rotation)

security: implement rate limiting, helmet, cors restriction, auth guards, and untrack firebase config

feat: complete cross-platform Native Desktop App (Mac & Windows) with zero logic change for Cloud

push all

feat: initial release of Drive to YouTube streaming engine