refactor: replace hardcoded hex colors with theme tokens, move data/ to root

- Add --color-green-mid token (#4a7a55) to @theme for dimmer stat values
- Replace all text-[#hex]/bg-[#hex] arbitrary values with named tokens:
  text-green, text-green-light, text-green-sec, text-green-muted,
  text-green-dark, text-green-mid, text-text, bg-card, bg-bg, border-border
- Replace rgba(34,197,94,X) inline styles with bg-green/X opacity modifiers
- Convert single-prop style={{ borderColor/background }} to className
- Fix SVG stroke="#dff5e8" → stroke="currentColor"
- Use CSS variables in globals.css base styles (background-color, color)
- Move app/data/wikipedia/ → data/ (project root, not inside Next.js app dir)
- Update Dockerfile, seed.ts, scrape-wikipedia.ts paths accordingly
- Remove unused app/data/world_cup.csv

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

data/2014/worldcup.groups.json

@@ -0,0 +1,76 @@
+{
+  "groups": [
+    {
+      "name": "Group A",
+      "teams": [
+        "Brazil",
+        "Croatia",
+        "Mexico",
+        "Cameroon"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "Spain",
+        "Netherlands",
+        "Chile",
+        "Australia"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "Colombia",
+        "Greece",
+        "Ivory Coast",
+        "Japan"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Uruguay",
+        "Costa Rica",
+        "England",
+        "Italy"
+      ]
+    },
+    {
+      "name": "Group E",
+      "teams": [
+        "Switzerland",
+        "Ecuador",
+        "France",
+        "Honduras"
+      ]
+    },
+    {
+      "name": "Group F",
+      "teams": [
+        "Argentina",
+        "Bosnia and Herzegovina",
+        "Iran",
+        "Nigeria"
+      ]
+    },
+    {
+      "name": "Group G",
+      "teams": [
+        "Germany",
+        "Portugal",
+        "Ghana",
+        "United States"
+      ]
+    },
+    {
+      "name": "Group H",
+      "teams": [
+        "Belgium",
+        "Algeria",
+        "Russia",
+        "South Korea"
+      ]
+    }
+  ]
+}

data/2014/worldcup.meta.json

@@ -0,0 +1,8 @@
+{
+  "host": "Brazil",
+  "teams_count": 32,
+  "winner": "Germany",
+  "runner_up": "Argentina",
+  "third_place": "Netherlands",
+  "fourth_place": "Brazil"
+}

data/2014/worldcup.stadiums.json

@@ -0,0 +1,60 @@
+{
+  "stadiums": [
+    {
+      "name": "Estádio Mineirão",
+      "city": "Belo Horizonte"
+    },
+    {
+      "name": "Estádio do Maracanã",
+      "city": "Rio de Janeiro"
+    },
+    {
+      "name": "Estádio Castelão",
+      "city": "Fortaleza"
+    },
+    {
+      "name": "Itaipava Arena Pernambuco",
+      "city": "Recife"
+    },
+    {
+      "name": "Estádio Nacional Mané Garrincha",
+      "city": "Brasília"
+    },
+    {
+      "name": "Estádio Beira-Rio",
+      "city": "Porto Alegre"
+    },
+    {
+      "name": "Arena Corinthians",
+      "city": "São Paulo"
+    },
+    {
+      "name": "Itaipava Arena Fonte Nova",
+      "city": "Salvador"
+    },
+    {
+      "name": "Maracanã Stadium",
+      "city": "Rio de Janeiro"
+    },
+    {
+      "name": "Arena de São Paulo",
+      "city": "São Paulo"
+    },
+    {
+      "name": "Arena das Dunas",
+      "city": "Natal"
+    },
+    {
+      "name": "Arena da Amazônia",
+      "city": "Manaus"
+    },
+    {
+      "name": "Arena Pantanal",
+      "city": "Cuiabá"
+    },
+    {
+      "name": "Arena da Baixada",
+      "city": "Curitiba"
+    }
+  ]
+}