Fix CI Node install before code generation

[cursor]

Bug and impact

Master CI fails during just code-gen because generate-ts-client invokes openapi-ts before any Node dependencies are installed. This blocks the Build workflow on clean GitHub runners.

Root cause

The workflow moved actions/setup-node after code generation and never ran npm ci before npm run generate:client, so the workspace binary openapi-ts is absent.

Fix

Set up Node from .nvmrc and run npm ci before just code-gen, then reuse that Node setup for the later frontend build.

Validation

• Confirmed the failed master run ends with sh: 1: openapi-ts: not found in Generate OpenAPI code.
• Reproduced locally with no node_modules: npm run generate:client fails with openapi-ts: not found.
• Verified after npm ci: CXX=g++ ./catalog-svc/generate-openapi.sh && npm run generate:client succeeds and leaves the working tree clean.