Initial commit: football competition standings viewer

Vite + React app using football-data.org API to display standings
and match details for 12 competitions. Supports competition switching,
team match history modal, and Vite proxy to handle CORS.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

src/competitions.js

@@ -0,0 +1,16 @@
+const COMPETITIONS = [
+  { code: 'PL',  name: 'Premier League',            country: 'England' },
+  { code: 'CL',  name: 'Champions League',           country: 'Europe' },
+  { code: 'BL1', name: 'Bundesliga',                 country: 'Germany' },
+  { code: 'SA',  name: 'Serie A',                    country: 'Italy' },
+  { code: 'PD',  name: 'Primera División',           country: 'Spain' },
+  { code: 'FL1', name: 'Ligue 1',                    country: 'France' },
+  { code: 'DED', name: 'Eredivisie',                 country: 'Netherlands' },
+  { code: 'PPL', name: 'Primeira Liga',              country: 'Portugal' },
+  { code: 'ELC', name: 'Championship',               country: 'England' },
+  { code: 'BSA', name: 'Brasileirão Série A',        country: 'Brazil' },
+  { code: 'EC',  name: 'European Championship',      country: 'Europe' },
+  { code: 'WC',  name: 'FIFA World Cup',             country: 'World' },
+]
+
+export default COMPETITIONS