fix(vikunja): remove healthcheck — container has no shell/wget

The vikunja/vikunja:0.24.6 image is a scratch/distroless build with
only the Go binary. wget, curl, sh, and all other utilities are
missing, making in-container healthchecks impossible.

Removing the healthcheck lets the controller detect the container
as "running" directly from Docker state, which is the correct
behavior for shell-less images.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

templates/vikunja/docker-compose.yml

@@ -26,12 +26,6 @@ services:
       resources:
         limits:
           memory: 256M
-    healthcheck:
-      test: ["CMD", "wget", "--spider", "-q", "http://localhost:3456/api/v1/info"]
-      interval: 30s
-      timeout: 5s
-      retries: 3
-      start_period: 30s
     labels:
       - "traefik.enable=true"
       - "traefik.http.routers.vikunja.rule=Host(`${SUBDOMAIN}.${DOMAIN}`)"