OSNVR/OS-NVR ? reverse-engineered prompt

Build me a lightweight CCTV web app that I can run on my own server to manage a few security cameras.

I want a clean mobile friendly dashboard where I can add cameras, watch live streams, browse recordings, and jump around a timeline to find important moments. It should support motion alerts, object detection as an optional addon, and a simple way to plug in extra features later without rewriting the whole app.

Please make it feel practical and easy to use, with a web interface that works well on phones and desktops, plus an API so I can automate setup and control if needed. If you need to check current docs or best practices for anything, go ahead and look them up.

Keep it lightweight, reliable, and focused on everyday CCTV use, not a huge enterprise system.