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>

components/live-badge.tsx

@@ -1,8 +1,8 @@
 export function LiveBadge({ label = 'Live' }: { label?: string }) {
   return (
     <div className="flex items-center gap-2">
-      <span className="w-2 h-2 rounded-full bg-[#4ade80] flex-shrink-0 animate-live" />
-      <span className="text-[11px] font-bold text-[#4ade80] tracking-[0.14em] uppercase">{label}</span>
+      <span className="w-2 h-2 rounded-full bg-green-light flex-shrink-0 animate-live" />
+      <span className="text-[11px] font-bold text-green-light tracking-[0.14em] uppercase">{label}</span>
     </div>
   )
 }