chore: nest project under Arduino/WeatherPredictor

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

WeatherPredictor/app_settings.h

@@ -1,15 +0,0 @@
-#pragma once
-#include <Arduino.h>
-
-struct AppSettings {
-  float altitudeM;
-  int   tzOffsetMin;
-  float lat;
-  float lon;
-};
-
-extern AppSettings settings;
-
-void settingsBegin();
-bool settingsSave();
-void settingsDefaults();