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

templates/documentation/.devcontainer/devcontainer.json

@@ -1,6 +1,6 @@
 {
   "name": "HugoBlox Codespace",
-  "image": "ghcr.io/HugoBlox/hugo-blox-dev:hugo0.159.2",
+  "image": "ghcr.io/HugoBlox/hugo-blox-dev:hugo0.161.0",
   "updateContentCommand": "pnpm install --frozen-lockfile --prefer-offline",
   "postCreateCommand": "pnpm --version && hugo version",
   "customizations": {