swarmexec v1.4.0 — richer service rows in the UI, site polish

UI:
- The interactive containers tree now shows each service like a
  `docker service ls` line — mode (replicated/global/…-job),
  running/desired, image and published ports.

Site:
- A favicon (terminal-prompt mark), a robots.txt, an Umami session
  recorder on the landing and docs pages, and a new privacy-notice
  section disclosing the recording.