Unable to access Label Studio via port forwarding in Docker development mode

**Description:**
Following the [installation guide](https://labelstud.io/guide/install.html#Install-from-source), I set up Label Studio in a local Docker container. I forwarded the container's port 8080 to the host machine's port 7999 and started the server in development mode at http://localhost:8080. However, when attempting to access the host machine's IP via http://:7999, I encounter a "Connection refused" error.

**Steps to Reproduce:**

1.Installed Label Studio in a Docker container.

2.Mapped container port 8080 to host port 7999 (via -p 7999:8080).

3.Started the server with development mode: poetry run python label_studio/manage.py runserver

4.Tried accessing http://localhost:7999 or http://:7999 but failed with connection refusal.

Expected Behavior:
Successful access to the Label Studio web interface via the forwarded port.

Additional Context:

Docker and network configurations appear normal.

No firewall/security rules blocking the port.

Any help resolving this issue would be greatly appreciated.