stats: core-7 economy page with CPI index levels, rebase and categories

- /stats/economy defaults multi-country charts to CAN KOR CHN JPN USA NLD CUW,
  with add-a-country chips and an EU 27 comparison line
- CPI index levels rebased to a chosen base year, index/YoY toggle,
  categories (food, energy, housing, core) where the source has them
- new no-key collectors: oecd (CPI categories, 10y yields), statcan (CPI);
  bis WS_LONG_CPI, FRED US CPI categories, Eurostat prc_hicp_minr, WB FP.CPI.TOTL
- Canada added as a region; CBS Curacao fallbacks for growth/unemployment
- timers stats-oecd and stats-statcan

scripts/stats/fred.ts

@@ -155,6 +155,21 @@ export const FRED_SERIES: Fred[] = [
 		region: 'USA',
 		theme: 'economy'
 	},
+	...(
+		[
+			['CPIUFDSL', 'food'],
+			['CPIHOSSL', 'housing'],
+			['CPIENGSL', 'energy'],
+			['CPILFESL', 'all items less food and energy']
+		] as const
+	).map(([id, what]) => ({
+		id,
+		title: `US consumer price index (CPI-U), ${what}`,
+		unit: 'Index 1982-84=100',
+		freq: 'M' as const,
+		region: 'USA',
+		theme: 'economy'
+	})),
 	{
 		id: 'UNRATE',
 		title: 'US unemployment rate',