Add energy tracker (/projects/energy)

Public, read-only page over the ned-collector energy schema: latest-hour
mix and per-source utilization, generation vs consumption with CO2
intensity (day/week/month/12 months/all years), NED forecast, gas storage
by year and per site, and gas-fired power share vs storage fill.
Incomplete hours (sources not summing to the NED total) are left out and
partial days/months/years are marked.

src/routes/sitemap.xml/+server.ts

@@ -18,6 +18,7 @@ const staticPaths = [
 	'/projects/game-tracker/osu',
 	'/projects/game-tracker/pokemon/locations',
 	'/projects/animaldex',
+	'/projects/energy',
 	'/projects/derby',
 	'/projects/spotify-beatmap-finder',
 	'/projects/world-opinions',