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/1974/worldcup.groups.json

@@ -3,7 +3,7 @@
     {
       "name": "Group 1",
       "teams": [
-        "West Germany",
+        "Germany",
         "Chile",
         "East Germany",
         "Australia"
@@ -49,7 +49,7 @@
       "name": "Group B",
       "teams": [
         "Yugoslavia",
-        "West Germany",
+        "Germany",
         "Sweden",
         "Poland"
       ]