Improve actions performance #40

ci: gate lint and typecheck on paths-filter

ci: only run push trigger on main

ci: install Node before pnpm so pnpm runs on Node 22

ci: switch FTPS deploys to lftp with retry and parallel transfer

ci: speed up lftp install with fast-path + fallback

ci: cache ESLint results between runs

ci: cache .nuxt build cache and disable Nuxt telemetry

ci: drop Node 20 actions (pnpm/action-setup, dorny/paths-filter)

ci: drop bobheadxi/deployments + bump action versions to Node 22

ci: drop invalid administration permission, make env-delete best-effort

ci: replace artifacts with cache, single preview env

ci: bump action versions to Node 24 latest

ci: post preview URL as PR comment

ci: set preview deployment URL via API instead of environment.url

ci: move preview URL set into a separate job

ci: same URL-set pattern for production

ci: merge URL-set jobs into one set-environment-url

ci: pin action versions to commit SHAs