feat(data): 添加了 2026 ICPC&CCPC山东省赛 ，贡献人为qwedc001 (#271)

Co-authored-by: qwedc001 <14366166+qwedc001@users.noreply.github.com>

Author: github-actions[bot]

data/groups.json

@@ -57,6 +57,14 @@
     }
   ],
   "contest": [
+    {
+      "name": "2026年SDCPC",
+      "groupid": "746693173",
+      "owner": "山东大学",
+      "notes": "2026 ICPC&CCPC山东省赛官方群",
+      "comments": "5.23~5.24",
+      "pinned": false
+    },
     {
       "name": "2026 ICPC 深圳邀请赛 4/11",
       "groupid": "1041437005",