The .gitignore fix in 4b8277a was reverted by 0d243fc, which re-tracked
a root-level .next/ (258MB, 2521 files) that this repo never needed —
the Dockerfile only consumes build/ (the rsynced standalone output from
build.sh). With no .dockerignore, that dead weight plus .git (bloated
to 725MB from repeated .next churn) was shipped into every Docker build
context on Dokploy, causing build failures/timeouts that surfaced as a
502 after deploy.
