Fix regex for validating daemon port input

如果有字符就报错，不直接转为数字

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

apps/extension/src/transport/daemon-endpoint.ts

@@ -33,6 +33,7 @@ export function normalizeDaemonPort(raw: unknown): number {
 export function parseDaemonPortInput(text: string): number | null {
   const trimmed = text.trim();
   if (trimmed === "") return DEFAULT_DAEMON_PORT;
+  if (!/^\d+$/.test(trimmed)) return null;
   const parsed = Number.parseInt(trimmed, 10);
   if (!isValidPort(parsed)) return null;
   return parsed;