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/docs-master/HOST-DEPS.md

@@ -0,0 +1,22 @@
+# Host dependencies for every Forgejo module
+
+The installer lives in **verae-bootstrap** (not this summaries repo):
+
+- Script: `scripts/host-deps.sh`
+- Manifest: `host-deps.tsv` (one row per Forgejo repo)
+- Narrative: [HOST-DEPS.md](https://git.georgelambert.org/marchon/verae-bootstrap/src/branch/main/HOST-DEPS.md)
+
+It detects Debian/Ubuntu vs Alpine (and best-effort macOS), checks that git, curl, Node, native build tools, and `nats-server` are present, and **downloads/installs** whatever is missing on **this** machine.
+
+```bash
+git clone ssh://git@git.georgelambert.org:2223/marchon/verae-bootstrap.git
+cd verae-bootstrap
+bash scripts/host-deps.sh --check --type ns1-all-in-one
+bash scripts/host-deps.sh --type ns1-all-in-one
+export VERAE_SRC=$HOME/verae-src
+bash scripts/fetch.sh ns1-all-in-one
+```
+
+Alpine if `bash` is not installed yet: `apk add --no-cache bash git curl`.
+
+Catalog hostname move (relative PDFs): [CATALOG-HOST.md](CATALOG-HOST.md).