fix(validators): restore 2+ char domain label requirement

- Replace (?:[a-z\\d-]{0,61}[a-z\\d])? with (?:[a-z\\d-]{1,61}[a-z\\d]) to keep labels 2–63 chars
- Avoid unintentionally allowing single-character labels (e.g. a.com) introduced by the previous regex change

Co-authored-by: Copilot <175728472+Copilot@users.noreply.github.com>

server/lib/validators.ts

@@ -68,7 +68,7 @@ export function isUrlValid(url: string | undefined) {
     if (!url) return true; // the link is optional in the schema so if it's empty it's valid
     var pattern = new RegExp(
         "^(https?:\\/\\/)?" + // protocol
-            "((([a-z\\d](?:[a-z\\d-]{0,61}[a-z\\d])?)\\.)+[a-z]{2,}|" + // domain name
+            "(((?:[a-z\\d-]{1,61}[a-z\\d])\\.)+[a-z]{2,}|" + // domain name
             "((\\d{1,3}\\.){3}\\d{1,3}))" + // OR ip (v4) address
             "(\\:\\d+)?(\\/[-a-z\\d%_.~+]*)*" + // port and path
             "(\\?[;&a-z\\d%_.~+=-]*)?" + // query string