chore(deps): upgrade to Hugo v0.161.0 (css.TailwindCSS Node.js sandbox)

Hugo v0.161 dropped the standalone tailwindcss binary; @tailwindcss/cli
npm package is now the only accepted transformer, invoked via
`node --permission` (Node >= 22 required).

- Bump module.hugoVersion.min to 0.161.0 in modules/blox/hugo.yaml;
  add comment explaining why security.node.permissions is left to
  Hugo's built-in defaults
- Bump hugo_version / HUGO_VERSION / devcontainer image tag to 0.161.0
  across all 9 templates (hugoblox.yaml, netlify.toml, devcontainer.json)
- Bump devcontainer base image Node 20 → 22 and default Hugo version
- Add scripts/check-template-deps.mjs to assert every template declares
  tailwindcss + @tailwindcss/cli; wire as pnpm check:template-deps
- Harden CI: new audit-template-deps job gates all build jobs; add
  `require.resolve('@tailwindcss/cli/package.json')` check after each
  pnpm install to catch the exact "binary is not a Node.js script" failure

.devcontainer/base.Dockerfile

@@ -3,9 +3,9 @@
 
 FROM mcr.microsoft.com/devcontainers/go:1.22-bookworm
 
-ARG NODE_VERSION=20
+ARG NODE_VERSION=22
 ARG PNPM_VERSION=10.14.0
-ARG HUGO_VERSION=0.152.2
+ARG HUGO_VERSION=0.161.0
 
 ENV DEBIAN_FRONTEND=noninteractive
 ENV PNPM_HOME=/home/vscode/.local/share/pnpm