The forecast path had no backup — unlike history, which falls back to NASA POWER.
When Open-Meteo's forecast API was rate-limited or down, the recent/forecast
bundle (and every endpoint that grades future days) failed with a 503.
Add MET Norway (yr.no) Locationforecast as a keyless, global forecast backup,
mirroring the NASA POWER role for history:
- _metno_to_frame: aggregates MET Norway's sub-daily timeseries into the daily
schema, converting units (°C→°F, mm→in, m/s→mph) and deriving feels-like from
the NWS heat index / wind chill (MET has no gusts or apparent temperature).
Precip prefers the 1-hour block and falls back to the 6-hour block so the
hourly→6-hourly resolution switch never double-counts.
- _fetch_forecast_metno: the backup fetch, with the ToS-required identifying
User-Agent and coordinates rounded to 4 decimals.
- _load_recent_forecast: on any Open-Meteo forecast failure, try MET Norway
before surfacing the error; a shared rate limit still raises the typed,
daily-aware WeatherUnavailable.
MET Norway is forecast-only (no recent past days), so it's a degraded-but-working
fallback: the forecast / day-ahead views keep serving during an Open-Meteo outage.
Tests cover the daily aggregation + unit conversion (incl. the no-double-count
precip rule) and the fallback wiring.
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