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/2006/worldcup.groups.json

@@ -0,0 +1,76 @@
+{
+  "groups": [
+    {
+      "name": "Group A",
+      "teams": [
+        "Germany",
+        "Costa Rica",
+        "Poland",
+        "Ecuador"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "England",
+        "Paraguay",
+        "Trinidad and Tobago",
+        "Sweden"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "Argentina",
+        "Ivory Coast",
+        "Serbia and Montenegro",
+        "Netherlands"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Mexico",
+        "Iran",
+        "Angola",
+        "Portugal"
+      ]
+    },
+    {
+      "name": "Group E",
+      "teams": [
+        "United States",
+        "Czech Republic",
+        "Italy",
+        "Ghana"
+      ]
+    },
+    {
+      "name": "Group F",
+      "teams": [
+        "Australia",
+        "Japan",
+        "Brazil",
+        "Croatia"
+      ]
+    },
+    {
+      "name": "Group G",
+      "teams": [
+        "South Korea",
+        "Togo",
+        "France",
+        "Switzerland"
+      ]
+    },
+    {
+      "name": "Group H",
+      "teams": [
+        "Spain",
+        "Ukraine",
+        "Tunisia",
+        "Saudi Arabia"
+      ]
+    }
+  ]
+}

app/data/wikipedia/2006/worldcup.stadiums.json

@@ -0,0 +1,52 @@
+{
+  "stadiums": [
+    {
+      "name": "Allianz Arena",
+      "city": "Munich"
+    },
+    {
+      "name": "Zentralstadion",
+      "city": "Leipzig"
+    },
+    {
+      "name": "Gottlieb-Daimler-Stadion",
+      "city": "Stuttgart"
+    },
+    {
+      "name": "Frankenstadion",
+      "city": "Nuremberg"
+    },
+    {
+      "name": "Fritz-Walter-Stadion",
+      "city": "Kaiserslautern"
+    },
+    {
+      "name": "RheinEnergieStadion",
+      "city": "Cologne"
+    },
+    {
+      "name": "Westfalenstadion",
+      "city": "Dortmund"
+    },
+    {
+      "name": "Niedersachsenstadion",
+      "city": "Hanover"
+    },
+    {
+      "name": "Olympiastadion",
+      "city": "Berlin"
+    },
+    {
+      "name": "Volksparkstadion",
+      "city": "Hamburg"
+    },
+    {
+      "name": "Arena AufSchalke",
+      "city": "Gelsenkirchen"
+    },
+    {
+      "name": "Waldstadion",
+      "city": "Frankfurt"
+    }
+  ]
+}