feat(ci): add server build validation to CI workflow

[Xenon010101]

What

Add server build validation step to the CI workflow to ensure the backend can complete its production build during pull requests.

Root cause

The CI validated server code via type checking and tests, but never verified that the production build (prisma generate && tsc) actually succeeds. Build-time issues could slip through.

Changes

• Added build-server job to .github/workflows/ci.yml
• Depends on typecheck-server and test-server (sequential pipeline)
• Runs npm run build which executes prisma generate && tsc
• Also added needs: [typecheck-server] to test-server for consistency

Verification

• Follows the same pattern as the existing build-client job
• No CI infrastructure changes needed

CI failures

N/A

Before

Server typechecking and tests passed, but production build could fail.

After

PR cannot merge if the server production build fails.

Closes #1395

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 34487de1-507a-494f-84f6-032fcf6e9cc3

📥 Commits

Reviewing files that changed from the base of the PR and between 0c176ae and d5a38ea.

📒 Files selected for processing (1)

• .github/workflows/ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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[github-actions]

Hi @Xenon010101, thanks for contributing to InternHack! 🎉

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