v2.1.2 Fix track map rendering and align Docker port configuration

Fixes

• Jagged track map — circuits drew as a coarse polygon when a session's position feed repeated coordinates instead of updating them (the 2026 Hungarian race gave 26 usable points a lap, against ~300 in qualifying). The outline lap is now chosen by position detail rather than lap time, falling back to another session from the same weekend. Requires re-compute for affected sessions. (reported by @starscream10)

• PORT ignored in Docker — setting PORT published one port but left the container listening on 8000, so the app was unreachable and only 8000 worked. Compose now maps the same port on both sides. (reported by @guilleortas)