Document catalog host moves and add per-module host-deps installer.

zapier-docs-master now has CATALOG-HOST.md (relative PDFs / rewrite-docs-host.py)
and HOST-DEPS.md. verae-bootstrap/scripts/host-deps.sh checks and installs
git, Node, native build tools, and nats-server on Debian or Alpine from
host-deps.tsv (every Forgejo module). fetch.sh runs it before clone/npm.

packages/verae-bootstrap/scripts/test.sh

@@ -11,4 +11,10 @@ while read -r name; do
   [[ -z "$name" || "$name" == \#* ]] && continue
   grep -qx "$name" "$ROOT/repos.txt" || { echo "type repo not in master: $name" >&2; exit 1; }
 done < <(cat "$ROOT"/types/*/repos.txt)
+# every Forgejo module has a host-deps row
+while read -r name; do
+  [[ -z "$name" || "$name" == \#* ]] && continue
+  grep -q "^${name}|" "$ROOT/host-deps.tsv" || { echo "missing host-deps.tsv row: $name" >&2; exit 1; }
+done < "$ROOT/repos.txt"
+bash -n "$ROOT/scripts/host-deps.sh"
 echo OK