Yavsc.Web is an empty template/draft project — no useful code,
conceptually a duplicate of the front that lives in Yavsc.Org.
Remove its mentions from:
- Dockerfile, Dockerfile.backend: the COPY src/Yavsc.Web/*.csproj
step is useless (the project is referenced nowhere downstream)
- ROADMAP.md: the 'Perimetre technique' table no longer lists it
- doc/architecture/decoupage-organisation.md: removed from the
ASCII diagram and the per-project table
Note: this commit only removes references; the empty project
itself (src/Yavsc.Web/) and the yavsc.sln Project() entry are
left in place for now. A future commit can rm -rf the directory
and prune the .sln when we're sure nothing else still depends
on it.