Refactor code structure for improved readability and maintainability

addon/init.py

@@ -0,0 +1,16 @@
+from mitmproxy import http
+import asyncio
+from pkce_check import PKCEDowngradeChecker
+
+class PKCEAddon:
+    def __init__(self):
+        self.checker = PKCEDowngradeChecker()
+
+    async def request(self, flow: http.HTTPFlow):
+        print(f"[DEBUG] Processing request: {flow.request.method} {flow.request.pretty_url}")
+        try:
+            await self.checker.test(flow)
+        except Exception as e:
+            print(f"[ERROR] Addon failed: {e}")
+
+addons = [PKCEAddon()]