feat(data): migrate tournament dataset from mock to real 2026 world cup

Replace fictional tournament data with official World Cup 2026 roster, groups,
schedule, and initial results. All 48 qualified teams, 16 venues, and 104 matches
(72 group + 32 knockout) now reflect real tournament data with cross-source
verification.

Co-Authored-By: Claude Haiku 4.5 <noreply@anthropic.com>

data/groups.json

@@ -1,74 +1,74 @@
 {
   "A": [
     "MEX",
-    "SUI",
     "KOR",
-    "JAM"
+    "RSA",
+    "CZE"
   ],
   "B": [
     "CAN",
-    "ESP",
-    "EGY",
-    "NZL"
+    "SUI",
+    "QAT",
+    "BIH"
   ],
   "C": [
     "BRA",
-    "ENG",
-    "TUN",
-    "UZB"
+    "MAR",
+    "SCO",
+    "HAI"
   ],
   "D": [
     "USA",
-    "NED",
-    "GHA",
-    "PAR"
+    "AUS",
+    "PAR",
+    "TUR"
   ],
   "E": [
-    "ARG",
-    "AUT",
-    "CMR",
-    "QAT"
+    "GER",
+    "ECU",
+    "CIV",
+    "CUW"
   ],
   "F": [
-    "FRA",
-    "COL",
-    "NGA",
-    "AUS"
+    "NED",
+    "JPN",
+    "TUN",
+    "SWE"
   ],
   "G": [
-    "GER",
-    "URU",
-    "ALG",
-    "JPN"
+    "BEL",
+    "IRN",
+    "EGY",
+    "NZL"
   ],
   "H": [
-    "POR",
-    "SRB",
-    "SEN",
-    "CRC"
+    "ESP",
+    "URU",
+    "KSA",
+    "CPV"
   ],
   "I": [
-    "ITA",
-    "ECU",
-    "KSA",
-    "HON"
+    "FRA",
+    "SEN",
+    "NOR",
+    "IRQ"
   ],
   "J": [
-    "BEL",
-    "POL",
-    "IRN",
-    "PAN"
+    "ARG",
+    "AUT",
+    "ALG",
+    "JOR"
   ],
   "K": [
-    "CRO",
-    "TUR",
-    "CIV",
-    "CHI"
+    "POR",
+    "COL",
+    "UZB",
+    "COD"
   ],
   "L": [
-    "MAR",
-    "DEN",
-    "SCO",
-    "JOR"
+    "ENG",
+    "CRO",
+    "PAN",
+    "GHA"
   ]
 }