The diff was comparing HEAD vs origin after fetch, but before the
first real push they point to the same commit — producing an empty
diff and skipping all builds. Now saves HEAD before fetch so the
comparison works, and falls back to rebuild-all when HEAD hasn't
moved (first deploy or CI re-run on same commit).
Combines shared, blog, market, cart, events, federation, and account
into a single repository. Eliminates submodule sync, sibling model
copying at build time, and per-app CI orchestration.
Changes:
- Remove per-app .git, .gitmodules, .gitea, submodule shared/ dirs
- Remove stale sibling model copies from each app
- Update all 6 Dockerfiles for monorepo build context (root = .)
- Add build directives to docker-compose.yml
- Add single .gitea/workflows/ci.yml with change detection
- Add .dockerignore for monorepo build context
- Create __init__.py for federation and account (cross-app imports)
