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>

app/data/wikipedia/1986/worldcup.groups.json

@@ -0,0 +1,58 @@
+{
+  "groups": [
+    {
+      "name": "Group A",
+      "teams": [
+        "Bulgaria",
+        "Italy",
+        "Argentina",
+        "South Korea"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "Belgium",
+        "Mexico",
+        "Paraguay",
+        "Iraq"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "Canada",
+        "France",
+        "Soviet Union",
+        "Hungary"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Spain",
+        "Brazil",
+        "Algeria",
+        "Northern Ireland"
+      ]
+    },
+    {
+      "name": "Group E",
+      "teams": [
+        "Uruguay",
+        "West Germany",
+        "Scotland",
+        "Denmark"
+      ]
+    },
+    {
+      "name": "Group F",
+      "teams": [
+        "Morocco",
+        "Poland",
+        "Portugal",
+        "England"
+      ]
+    }
+  ]
+}

app/data/wikipedia/1986/worldcup.stadiums.json

@@ -0,0 +1,52 @@
+{
+  "stadiums": [
+    {
+      "name": "Estadio Azteca",
+      "city": "Mexico City"
+    },
+    {
+      "name": "Estadio Nou Camp",
+      "city": "León"
+    },
+    {
+      "name": "Estadio Jalisco",
+      "city": "Guadalajara"
+    },
+    {
+      "name": "Estadio Cuauhtémoc",
+      "city": "Puebla"
+    },
+    {
+      "name": "Estadio Olímpico Universitario",
+      "city": "Mexico City"
+    },
+    {
+      "name": "Estadio Universitario",
+      "city": "San Nicolás de los Garza"
+    },
+    {
+      "name": "Estadio La Corregidora",
+      "city": "Querétaro"
+    },
+    {
+      "name": "Estadio Toluca 70–86",
+      "city": "Toluca"
+    },
+    {
+      "name": "Estadio Sergio León Chavez",
+      "city": "Irapuato"
+    },
+    {
+      "name": "Estadio Tres de Marzo",
+      "city": "Zapopan"
+    },
+    {
+      "name": "Estadio Tecnológico",
+      "city": "Monterrey"
+    },
+    {
+      "name": "Estadio Neza 86",
+      "city": "Nezahualcóyotl"
+    }
+  ]
+}