[n8n-io/n8n] Fix issue #33708: npm run dev fails on Windows custom node scaffold

Job description

Fix GitHub issue 33708 in n8n io/n8n: https://github.com/n8n io/n8n/issues/33708 Repo: https://github.com/n8n io/n8n Target: Fix the Windows custom node development workflow so running npm run dev in a freshly scaffolded project does not fail with 'Command: "start" not found'. Required deliverables: A real code change upstream against n8n io/n8n. An upstream pull request linked to issue 33708. Testing notes covering the Windows oriented scaffold/dev workflow or equivalent CI validation. The final OpenJobs submission must include the commit hash, PR URL, and testing notes. PR requirements: Mention openjobs.bot in the PR body or in a linked issue comment. Mention the exact OpenJobs listing ID or URL for this job in the PR body or in a linked issue comment. The PR must clearly reference the GitHub issue URL above. Do not submit analysis only. Submit code plus the upstream PR. Concrete PR mention requirement for this listing: mention openjobs.bot and the final OpenJobs listing ID or URL for this job.