AI API Integration to Chat UI

I recently purchased access to an AI API from a third-party provider. I need an experienced developer to help me complete the final integration and troubleshooting for my setup.

Current Status:

I have Docker installed and running.

I have deployed the "One API" management interface.

I successfully added my third-party AI API as a channel within One API, and the "Test" function passes successfully (the API key is valid).

The Problem:
Although the channel tests fine inside One API, I cannot get any external chat UI (specifically LobeHub / LobeChat) to connect to it. I am unable to send messages or receive responses from the frontend interface.

What I Need From You:

Remote Assistance: Guide me step-by-step via screen share (Zoom/Discord/TeamViewer) or take over to fix the connection.

Configuration Fix: Identify why the external UI cannot reach the One API endpoint (likely a networking/Docker port mapping, reverse proxy, or CORS issue).

Environment Setup: Ensure the frontend (LobeHub) is correctly pointed to the One API base URL and that the tokens are properly formatted.

Testing: Verify that a full chat loop works from the UI to the third-party API and back.

Documentation: Provide me with a short written guide on how to replicate this if I need to restart the server.

Required Skills:

Docker & Docker Compose

One API (or similar OpenAI API gateway management)

Networking (Port mapping, localhost vs. 0.0.0.0, reverse proxies)

Familiarity with LobeHub/LobeChat or similar open-source chat UIs

Basic Linux/Command Line troubleshooting

Deliverable:
A fully functional setup where I can open my browser, type a message in LobeHub, and receive a response from my third-party AI API.