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/package.json

@@ -6,6 +6,7 @@
   "scripts": {
     "clone": "bash scripts/clone.sh",
     "deps": "bash scripts/install-deps.sh",
+    "host-deps": "bash scripts/host-deps.sh",
     "fetch": "bash scripts/fetch.sh",
     "test": "bash scripts/test.sh"
   }