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/2018/worldcup.groups.json

@@ -0,0 +1,76 @@
+{
+  "groups": [
+    {
+      "name": "Group A",
+      "teams": [
+        "Russia",
+        "Saudi Arabia",
+        "Egypt",
+        "Uruguay"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "Morocco",
+        "Iran",
+        "Portugal",
+        "Spain"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "France",
+        "Australia",
+        "Peru",
+        "Denmark"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Argentina",
+        "Iceland",
+        "Croatia",
+        "Nigeria"
+      ]
+    },
+    {
+      "name": "Group E",
+      "teams": [
+        "Costa Rica",
+        "Serbia",
+        "Brazil",
+        "Switzerland"
+      ]
+    },
+    {
+      "name": "Group F",
+      "teams": [
+        "Germany",
+        "Mexico",
+        "Sweden",
+        "South Korea"
+      ]
+    },
+    {
+      "name": "Group G",
+      "teams": [
+        "Belgium",
+        "Panama",
+        "Tunisia",
+        "England"
+      ]
+    },
+    {
+      "name": "Group H",
+      "teams": [
+        "Colombia",
+        "Japan",
+        "Poland",
+        "Senegal"
+      ]
+    }
+  ]
+}

app/data/wikipedia/2018/worldcup.stadiums.json

@@ -0,0 +1,52 @@
+{
+  "stadiums": [
+    {
+      "name": "Kazan Arena",
+      "city": "Kazan"
+    },
+    {
+      "name": "Fisht Olympic Stadium",
+      "city": "Sochi"
+    },
+    {
+      "name": "Luzhniki Stadium",
+      "city": "Moscow"
+    },
+    {
+      "name": "Nizhny Novgorod Stadium",
+      "city": "Nizhny Novgorod"
+    },
+    {
+      "name": "Cosmos Arena",
+      "city": "Samara"
+    },
+    {
+      "name": "Rostov Arena",
+      "city": "Rostov-on-Don"
+    },
+    {
+      "name": "Krestovsky Stadium",
+      "city": "Saint Petersburg"
+    },
+    {
+      "name": "Otkritie Arena",
+      "city": "Moscow"
+    },
+    {
+      "name": "Central Stadium",
+      "city": "Yekaterinburg"
+    },
+    {
+      "name": "Volgograd Arena",
+      "city": "Volgograd"
+    },
+    {
+      "name": "Mordovia Arena",
+      "city": "Saransk"
+    },
+    {
+      "name": "Kaliningrad Stadium",
+      "city": "Kaliningrad"
+    }
+  ]
+}