Fix assets:create 404: form-urlencoded mot /apps/richdocuments/assets, intern CODE över HTTP

- lib/bridge.js createAssetLink: POST <nextcloudUrl>/apps/richdocuments/assets
  (utan index.php), Content-Type application/x-www-form-urlencoded med body
  path=<urlencoded>, path trimmad utan ledande slash (userFolder->get relativt
  filrot), OCS-APIRequest borttagen. Fel inkluderar statusCode + svarskropp.
- Intern collaboraUrl är HTTP: http://code:9980 (fallback http://<bridge-ip>:9980)
  i nc-collab-config default, .env.example, example-flows.json, docker-compose,
  install.sh och integrate-into-nodered.sh resolve_collabora_url.
- Publik WOPI-URL dokumenterad som https://docs.domain.name.
- package-lock.json för deterministisk form-data-install i Docker.

docker-compose.yml

@@ -13,7 +13,7 @@ services:
       PORT: "1881"
       TZ: ${TZ:-Europe/Stockholm}
       NEXTCLOUD_URL: ${NEXTCLOUD_URL:-https://cloud.domain.name}
-      COLLABORA_URL: ${COLLABORA_URL:-https://code:9980}
+      COLLABORA_URL: ${COLLABORA_URL:-http://code:9980}
     extra_hosts:
       - "host.docker.internal:host-gateway"
       - "cloud.domain.name:${NC_HOST_IP:-192.168.1.10}"