chore(ci): add lint stage and external network for deployment

Merged Nguyễn Ngọc Đại requested to merge hotfix/add-job-lintto-ci/cd into main
  • Introduce lint stage in GitLab CI running TypeScript type checks via tsc
  • Add external sales-it-network to docker-compose and attach frontend service
  • Add lint script (tsc --noEmit) to package.json

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