refactor: consolidate data/ into single root directory, fix historical player names

Merge data/wikipedia/{year}/ into data/{year}/ so there is a single
canonical location for World Cup JSON files. Update scrape and seed
scripts to use data/ instead of data/wikipedia/.

Re-scraped all 22 years (1930-2022) with fixed player name extraction
(full name from <a title="..."> rather than abbreviated display text)
so historical goals now show e.g. "Thomas Müller" not "Müller".

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

data/1978/worldcup.stadiums.json

@@ -24,14 +24,6 @@
       "name": "Estadio Olímpico Chateau Carreras",
       "city": "Córdoba"
     },
-    {
-      "name": "Estadio José Amalfitani",
-      "city": "Buenos Aires"
-    },
-    {
-      "name": "Estadio José Maria Minella",
-      "city": "Mar del Plata"
-    },
     {
       "name": "Chateau Carreras",
       "city": "Córdoba"