Real CI at .gitea/workflows/ci.yml (Gitea reads .gitea/workflows, not the empty
untracked .git/workflows/ci.yml cruft): backend dotnet build + dotnet test (39 tests)
and frontend npm ci + build, on pushes to main/develop and all PRs. Establishes the
merge gate recommended in the Phase 7 git-workflow review.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
cesnimda