fix: port 80 hardcoded in main.py (was 8080)

main.py passes port=8080 to WebServer constructor, overriding the
DEFAULT_PORT in server.py. Changed to port=80.

main.py

@@ -241,7 +241,7 @@ class PedalApp:
             self.leds.preset_animate(direction="up")
 
             # ── 8. Web UI server (non-blocking HTTP + WebSocket) ────
-            # Runs on port 8080 by default, alongside the JACK audio loop.
+            # Runs on port 80 by default, alongside the JACK audio loop.
             try:
                 self.web = WebServer(
                     deps=WebServerDeps(
@@ -253,10 +253,10 @@ class PedalApp:
                         jack_audio=self.jack_audio,
                     ),
                     host="0.0.0.0",
-                    port=8080,
+                    port=80,
                 )
                 self.web.start()
-                logger.info("Web UI server started on http://0.0.0.0:8080")
+                logger.info("Web UI server started on http://0.0.0.0:80")
             except Exception as e:
                 logger.warning("Web UI server failed to start (non-fatal): %s", e)