feat: add Units converter tool to Kit stack

Added Units converter to the Kit toolkit at units.kit.pivoine.art:
- Unit conversion tool for length, weight, temperature, etc.
- Image: ghcr.io/valknarness/units-ui:latest
- Exposed on port 3000 via Traefik with SSL

Configuration:
- Added units service to kit/compose.yaml
- Added KIT_UNITS_IMAGE and KIT_UNITS_TRAEFIK_HOST to arty.yml
- Follows same pattern as other Kit tools (Vert, Paint, Pastel, Stirling)
- Watchtower enabled for automatic updates

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

arty.yml

@@ -123,6 +123,8 @@ envs:
     KIT_PASTEL_TRAEFIK_HOST: pastel.kit.pivoine.art
     KIT_STIRLING_IMAGE: frooodle/s-pdf:latest
     KIT_STIRLING_TRAEFIK_HOST: stirling.kit.pivoine.art
+    KIT_UNITS_IMAGE: ghcr.io/valknarness/units-ui:latest
+    KIT_UNITS_TRAEFIK_HOST: units.kit.pivoine.art
     # Jellyfin
     JELLY_TRAEFIK_ENABLED: true
     JELLY_COMPOSE_PROJECT_NAME: jelly

kit/compose.yaml

@@ -147,6 +147,31 @@ services:
       # Watchtower
       - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
 
+  units:
+    image: ${KIT_UNITS_IMAGE:-ghcr.io/valknarness/units-ui:latest}
+    container_name: ${KIT_COMPOSE_PROJECT_NAME}_units
+    restart: unless-stopped
+    networks:
+      - compose_network
+    labels:
+      - 'traefik.enable=${KIT_TRAEFIK_ENABLED}'
+      # HTTP to HTTPS redirect
+      - 'traefik.http.middlewares.${KIT_COMPOSE_PROJECT_NAME}-units-redirect-web-secure.redirectscheme.scheme=https'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web.middlewares=${KIT_COMPOSE_PROJECT_NAME}-units-redirect-web-secure'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web.rule=Host(`${KIT_UNITS_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web.entrypoints=web'
+      # HTTPS router
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web-secure.rule=Host(`${KIT_UNITS_TRAEFIK_HOST}`)'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web-secure.tls.certresolver=resolver'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web-secure.entrypoints=web-secure'
+      - 'traefik.http.middlewares.${KIT_COMPOSE_PROJECT_NAME}-units-compress.compress=true'
+      - 'traefik.http.routers.${KIT_COMPOSE_PROJECT_NAME}-units-web-secure.middlewares=${KIT_COMPOSE_PROJECT_NAME}-units-compress,security-headers@file'
+      # Service
+      - 'traefik.http.services.${KIT_COMPOSE_PROJECT_NAME}-units.loadbalancer.server.port=3000'
+      - 'traefik.docker.network=${NETWORK_NAME}'
+      # Watchtower
+      - 'com.centurylinklabs.watchtower.enable=${WATCHTOWER_LABEL_ENABLE}'
+
 networks:
   compose_network:
     name: ${NETWORK_NAME}