fix: let Gradio auto-select port locally, fix via env vars only

Dockerfile

@@ -16,7 +16,7 @@ COPY client/ ./client/
 
 RUN useradd -m user
 USER user
-ENV HOME=/home/user PATH=/home/user/.local/bin:$PATH GRADIO_SERVER_NAME=0.0.0.0
+ENV HOME=/home/user PATH=/home/user/.local/bin:$PATH GRADIO_SERVER_NAME=0.0.0.0 GRADIO_SERVER_PORT=7860
 
 EXPOSE 7860
 

app.py

@@ -527,4 +527,4 @@ with gr.Blocks(title="Inventory Simulation") as demo:
                 outputs=[llm_chart, llm_metrics, llm_log],
             )
 
-demo.launch(server_name=os.environ.get("GRADIO_SERVER_NAME", "127.0.0.1"), server_port=7860)
+demo.launch(server_name=os.environ.get("GRADIO_SERVER_NAME", "127.0.0.1"))