Add Pillow dependency and implement screenshot functionality in web server

webserver/web.py

@@ -1,6 +1,8 @@
 from flask import Flask, request, jsonify
 import os, ai.processor
 from dotenv import load_dotenv
+import io
+from PIL import ImageGrab
 
 load_dotenv()
 
@@ -36,6 +38,14 @@ class WebServerApp:
                     img_data = img_file.read()
                 else:
                     img_data = None
+            else:
+                if 'host_screenshot' in data:
+                    # take a screenshot right here
+                    # capture the full screen
+                    screenshot_img = ImageGrab.grab()
+                    buf = io.BytesIO()
+                    screenshot_img.save(buf, format='PNG')
+                    img_data = buf.getvalue() 
             
             import base64
             # Convert image data to base64 if provided