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.

flows/example-flows.json

@@ -11,7 +11,7 @@
         "type": "nc-collab-config",
         "name": "cloud.domain.name",
         "nextcloudUrl": "https://cloud.domain.name",
-        "collaboraUrl": "https://172.17.0.2:9980",
+        "collaboraUrl": "http://code:9980",
         "collaboraPublicUrl": "https://cloud.domain.name",
         "username": "FILL_IN_USER",
         "verifyTls": false