Install Node dependencies before CI code generation

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Bug and impact

The CI workflow moved Node setup before just code-gen, but still ran TypeScript client generation before installing npm dependencies. In a clean GitHub Actions runner, npm run generate:client cannot find the workspace-local openapi-ts binary, causing the build workflow to fail before build/test coverage runs.

Root cause

just code-gen includes generate-ts-client, which invokes npm run generate:client. actions/setup-node only installs Node and configures cache; it does not install packages from package-lock.json.

Fix

Add npm ci immediately after Node setup and before just code-gen, so the locked workspace dependencies are installed when code generation runs.

Validation

• Reproduced the clean-checkout failure: npm run generate:client exited 127 with openapi-ts: not found before installing dependencies.
• Ran npm ci and confirmed node_modules/.bin/openapi-ts is installed (openapi-ts --version => 0.93.1).
• Ran npm run generate:client successfully after dependency installation using generated OpenAPI output.
• Attempted the full equivalent codegen path; local runner lacks the C++ standard library needed by rdkafka-sys, so that environment-specific compile step failed before completion.