Add Vercel domain configuration for kaiblog

domains/_vercel.kaiblog.json

@@ -0,0 +1,9 @@
+{
+  "owner": {
+    "username": "kai980621",
+    "email": "kaigithub0621@gmail.com"
+  },
+  "records": {
+    "TXT": "vc-domain-verify=kaiblog.is-a.dev,2729eed11c2ba58be763"
+  }
+}