DuarteSantos8/openGym ? reverse-engineered prompt

Build me a self hosted workout and body weight tracker that feels like a modern phone app, but runs on my own server and keeps my data in my own folder. I want to log workouts, plan weekly routines, track sets, reps, timed exercises, supersets, warm ups, rest timers, and body weight over time. It should show useful stats like progress charts, personal records, and which muscles have been trained or are getting neglected.

Make it easy to start with a few ready made routines, let me edit them, and support passkey login so I do not need passwords. It should work well on mobile, be installable like a PWA, and sync across devices. If possible, include import options from common workout apps like FitNotes, Strong, and Hevy. Use a clean, simple interface and make it easy to run with Docker Compose. If you need to check current docs or APIs, look them up online first.