Use `PyVirtualDisplay` by default if possible

[James4Ever0]

Currently it shows the browser everytime. It is due to the configuration. However headless Chrome could have issues when browsing certain websites.

I made some changes to src/proxy_lite/app.py. I also grab some environment variables into the config for easier manipulation.

--- a/src/proxy_lite/app.py
+++ b/src/proxy_lite/app.py
@@ -1,12 +1,13 @@
 import asyncio
 import base64
 from io import BytesIO
+import os
 
 import streamlit as st
 from PIL import Image
 
 from proxy_lite import Runner, RunnerConfig
-
+from pyvirtualdisplay import Display
 
 def get_user_config(config_expander):
     config = {
@@ -18,9 +19,9 @@ def get_user_config(config_expander):
             "viewport_width": 1280,
             "viewport_height": 1920,
             "include_poi_text": True,
-            "homepage": "https://www.google.com",
-            "keep_original_image": False,
-            "headless": False,  # without proxies headless mode often results in getting bot blocked
+            "homepage": os.environ.get("HOMEPAGE", "https://www.google.com"),
+            "keep_original_image": False,  
+            "headless": False,  # without proxies headless mode often results in getting bot blocked, but we use virtual display so it would not annoy us
         },
         "solver": {
             "name": "simple",
@@ -29,7 +30,7 @@ def get_user_config(config_expander):
                 "client": {
                     "name": "convergence",
                     "model_id": "convergence-ai/proxy-lite-3b",
-                    "api_base": "https://convergence-ai-demo-api.hf.space/v1",
+                    "api_base": os.environ.get("PROXY_LITE_API_BASE","https://convergence-ai-demo-api.hf.space/v1"),
                 },
             },
         },
@@ -209,28 +210,29 @@ def main():
         if submit_button:
             st.session_state.config_expanded = False
             if task:
-                # Create placeholders for dynamic updates
-                status_placeholder = st.empty()
-                st.write(" ")
-                action_placeholder = st.empty()
-                environment_placeholder = st.empty()
-                image_placeholder = st.empty()
-                history_placeholder = st.empty()
-
-                # Run the async task
-                asyncio.run(
-                    run_task_async(
-                        task,
-                        status_placeholder,
-                        action_placeholder,
-                        environment_placeholder,
-                        image_placeholder,
-                        history_placeholder,
-                        config,
-                    ),
-                )
-
-                st.success("Task completed!", icon="✨")
+                with Display() as disp:
+                    # Create placeholders for dynamic updates
+                    status_placeholder = st.empty()
+                    st.write(" ")
+                    action_placeholder = st.empty()
+                    environment_placeholder = st.empty()
+                    image_placeholder = st.empty()
+                    history_placeholder = st.empty()
+
+                    # Run the async task
+                    asyncio.run(
+                        run_task_async(
+                            task,
+                            status_placeholder,
+                            action_placeholder,
+                            environment_placeholder,
+                            image_placeholder,
+                            history_placeholder,
+                            config,
+                        ),
+                    )
+
+                    st.success("Task completed!", icon="✨")
             else:
                 st.error("Please give a task first!")