chore(traefik): remove dangling traefik-internal router labels

Leftover from an earlier failed attempt (referenced a since-removed
"internal" entrypoint, logging harmless "EntryPoint doesn't exist"
errors). The api.insecure + named "traefik" entrypoint approach now
in place supersedes it.

traefik/compose.yml

@@ -51,9 +51,6 @@ services:
       - "traefik.http.routers.traefik-dashboard-web-secure.tls.certresolver=resolver"
       - "traefik.http.routers.traefik-dashboard-web-secure.middlewares=vpn-only@file,security-headers@file,no-index@file"
       - "traefik.http.routers.traefik-dashboard-web-secure.service=api@internal"
-      - "traefik.http.routers.traefik-internal.rule=PathPrefix(`/`)"
-      - "traefik.http.routers.traefik-internal.entrypoints=internal"
-      - "traefik.http.routers.traefik-internal.service=api@internal"
     networks:
       - compose_network
       - coolify_network