fix: include UI apps build in CI release pipeline (#575)

The release workflow only ran `npm run build` (TypeScript), skipping the
UI apps build. This meant ui-apps/dist/ was missing from npm packages.

- Change `npm run build` to `npm run build:all` in build-and-verify and
  publish-npm jobs
- Copy ui-apps/dist into the npm publish directory
- Add ui-apps/dist/**/* to the published package files list
- Bump version to 2.34.2

Conceived by Romuald Czlonkowski - https://www.aiadvisors.pl/en

Co-authored-by: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "n8n-mcp",
-  "version": "2.34.1",
+  "version": "2.34.2",
   "description": "Integration between n8n workflow automation and Model Context Protocol (MCP)",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",