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/2022/worldcup.groups.json

@@ -0,0 +1,76 @@
+{
+  "groups": [
+    {
+      "name": "Group A",
+      "teams": [
+        "Qatar",
+        "Ecuador",
+        "Senegal",
+        "Netherlands"
+      ]
+    },
+    {
+      "name": "Group B",
+      "teams": [
+        "England",
+        "Iran",
+        "United States",
+        "Wales"
+      ]
+    },
+    {
+      "name": "Group C",
+      "teams": [
+        "Argentina",
+        "Saudi Arabia",
+        "Mexico",
+        "Poland"
+      ]
+    },
+    {
+      "name": "Group D",
+      "teams": [
+        "Denmark",
+        "Tunisia",
+        "France",
+        "Australia"
+      ]
+    },
+    {
+      "name": "Group E",
+      "teams": [
+        "Germany",
+        "Japan",
+        "Spain",
+        "Costa Rica"
+      ]
+    },
+    {
+      "name": "Group F",
+      "teams": [
+        "Morocco",
+        "Croatia",
+        "Belgium",
+        "Canada"
+      ]
+    },
+    {
+      "name": "Group G",
+      "teams": [
+        "Switzerland",
+        "Cameroon",
+        "Brazil",
+        "Serbia"
+      ]
+    },
+    {
+      "name": "Group H",
+      "teams": [
+        "Uruguay",
+        "South Korea",
+        "Portugal",
+        "Ghana"
+      ]
+    }
+  ]
+}

data/2022/worldcup.meta.json

@@ -0,0 +1,8 @@
+{
+  "host": "Qatar",
+  "teams_count": 32,
+  "winner": "Argentina",
+  "runner_up": "France",
+  "third_place": "Croatia",
+  "fourth_place": "Morocco"
+}

data/2022/worldcup.stadiums.json

@@ -0,0 +1,36 @@
+{
+  "stadiums": [
+    {
+      "name": "Khalifa International Stadium",
+      "city": "Al Rayyan"
+    },
+    {
+      "name": "Ahmad bin Ali Stadium",
+      "city": "Al Rayyan"
+    },
+    {
+      "name": "Al Thumama Stadium",
+      "city": "Doha"
+    },
+    {
+      "name": "Al Bayt Stadium",
+      "city": "Al Khor"
+    },
+    {
+      "name": "Al Janoub Stadium",
+      "city": "Al Wakrah"
+    },
+    {
+      "name": "Stadium 974",
+      "city": "Doha"
+    },
+    {
+      "name": "Education City Stadium",
+      "city": "Al Rayyan"
+    },
+    {
+      "name": "Lusail Stadium",
+      "city": "Lusail"
+    }
+  ]
+}