refactor: rename data/openfootball → data/wikipedia, drop data/kaggle

Move world_cup.csv to app/data/ directly (the only remaining Kaggle file
used by seed.ts for tournament metadata). Delete the rest of the Kaggle CSVs.
Update path constants in scrape-wikipedia.ts and seed.ts accordingly.

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

scripts/scrape-wikipedia.ts

@@ -7,7 +7,7 @@ import path from 'path'
 import { fileURLToPath } from 'url'
 
 const __dirname = path.dirname(fileURLToPath(import.meta.url))
-const DATA_DIR = path.join(__dirname, '../app/data/openfootball')
+const DATA_DIR = path.join(__dirname, '../app/data/wikipedia')
 
 const YEARS = [
   1930,1934,1938,1950,1954,1958,1962,1966,1970,1974,
@@ -543,7 +543,7 @@ async function main() {
     await delay(600)
   }
 
-  console.log('\nDone! Files written to app/data/openfootball/{year}/')
+  console.log('\nDone! Files written to app/data/wikipedia/{year}/')
 }
 
 main().catch(e => { console.error(e); process.exit(1) })