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

src/lib/stats/countries.ts

@@ -13,6 +13,7 @@ export const COUNTRY_PAGES = [
 	'BEL',
 	'GBR',
 	'JPN',
+	'CAN',
 	'IND',
 	'BRA',
 	'RUS',
@@ -34,6 +35,7 @@ export const FLAG: Record<string, string> = {
 	BEL: '🇧🇪',
 	GBR: '🇬🇧',
 	JPN: '🇯🇵',
+	CAN: '🇨🇦',
 	IND: '🇮🇳',
 	BRA: '🇧🇷',
 	RUS: '🇷🇺',
@@ -52,6 +54,7 @@ export const COUNTRY_COLOR: Record<string, string> = {
 	BEL: '#a16207',
 	GBR: '#a855f7',
 	JPN: '#ec4899',
+	CAN: '#dc2626',
 	IND: '#10b981',
 	BRA: '#84cc16',
 	RUS: '#0d9488',