feat: HTTP server with REST API for current/history/settings

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

WeatherPredictor/web_page.h

@@ -0,0 +1,3 @@
+#pragma once
+#include <Arduino.h>
+static const char INDEX_HTML[] PROGMEM = "<!doctype html><meta charset=utf-8><title>Weather Predictor</title><h1>Weather Predictor</h1><p>See <a href=/api/current>/api/current</a></p>";