fix(docker): invoke playwright CLI by package path to survive --omit=dev

fix(docker): symlink frontend node_modules into /app/backend so shared imports resolve

refactor: remove MUI, unify publisher pipeline, add shared component registry

fix: enable PDF generation by adding playwright dependency

fix: use multi-stage Docker build for backend compilation

fix: copy .npmrc into Docker frontend build stage

feat: add Playwright + Chromium to Dockerfile for PDF generation

chore: initial commit