fix: fail CI on lint/tsc errors, add Docker builds and security scanning

[Senthil455]

Changes

Fixed three CI issues: lint/tsc errors silently passing, no Docker builds, no security scanning.

What changed:

• Lint (line 31): Removed || echo "Lint warning" — lint errors now fail the build
• TypeCheck (line 33): Removed || true — TypeScript errors now fail the build
• Added npm test to Frontend CI
• Added npm audit to frontend and Node service jobs (high+ severity, continues on error)
• Added gosec security scanning to Go services job
• Added bandit security scanning to Python services job
• Added docker-build job — builds all 9 service images using Docker Buildx with GitHub Actions cache. Pushes to ghcr.io on push events, only builds on PRs.
• Added security-scan job — filesystem Trivy scan for HIGH/CRITICAL vulnerabilities, uploads SARIF results to GitHub Security tab

[Senthil455]

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