refactor: separate regional briefing and weather sources

server/providers/regional/weather.js

@@ -0,0 +1,23 @@
+import { fetchRegionalJson } from './http.js';
+import { normalizeRegionalWeather } from '../../../src/data/regionalBrief.js';
+
+const WEATHER_EFFECTS_MAX_RESPONSE_BYTES = 512 * 1024;
+
+async function fetchRegionalWeather(point) {
+  const params = new URLSearchParams({
+    latitude: point.latitude.toFixed(5),
+    longitude: point.longitude.toFixed(5),
+    current: 'temperature_2m,apparent_temperature,precipitation,weather_code,cloud_cover,wind_speed_10m,wind_direction_10m,visibility',
+    timezone: 'UTC',
+  });
+  try {
+    const payload = await fetchRegionalJson(`https://api.open-meteo.com/v1/forecast?${params}`, {
+      maxBytes: WEATHER_EFFECTS_MAX_RESPONSE_BYTES,
+    });
+    return normalizeRegionalWeather(payload);
+  } catch {
+    return null;
+  }
+}
+
+export { fetchRegionalWeather };