chore: add CI and security workflows

[fernandofatech]

Summary\n- adds pnpm build and dependency audit workflow\n- adds CodeQL and dependency review security workflow\n\n## Validation\n- workflow YAML committed for GitHub Actions execution

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[Copilot]

Pull request overview

Adds GitHub Actions workflows to provide baseline CI and security scanning for the repository’s Next.js frontend.

Changes:

• Introduces a CI workflow to install dependencies with pnpm, build the frontend, and run dependency audits.
• Introduces a Security workflow to run Dependency Review on PRs and CodeQL analysis on PRs/pushes/schedule.

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
.github/workflows/ci.yml	Adds pnpm-based install/build and runs vulnerability audits.
.github/workflows/security.yml	Adds Dependency Review (PR-only) and CodeQL scanning (PR/push/scheduled).

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