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.groups.json

@@ -12,21 +12,12 @@
     {
       "name": "Group 2",
       "teams": [
-        "West Germany",
+        "Germany",
         "Poland",
         "Tunisia",
         "Mexico"
       ]
     },
-    {
-      "name": "Group 3",
-      "teams": [
-        "Austria",
-        "Spain",
-        "Brazil",
-        "Sweden"
-      ]
-    },
     {
       "name": "Group 4",
       "teams": [
@@ -42,7 +33,7 @@
         "Austria",
         "Netherlands",
         "Italy",
-        "West Germany"
+        "Germany"
       ]
     },
     {