Proxion v0.10.1

Changed

• Alert notifications are formatted per channel instead of plain text: email is an HTML message
  with a card per alert and an "Open in Proxion" button (plain-text alternative kept), Discord
  gets embeds, Slack gets blocks, ntfy and Gotify get Markdown with a click action, and the
  generic webhook gains headline, highestSeverity, sentAt and per-event
  guestName/guestType/label/color. Events now carry the guest's name and type, the email
  subject is [site] headline — first alert, and "Send test" sends two realistic sample alerts.
  No env variable, channel selection or route changes.

Fixed

• Deploy kit: set-env.sh writes values single-quoted so Docker Compose never interpolates a
  $ inside a secret (an SMTP password containing $abc used to be silently truncated).