Fix up API handling logic for keys and set a prefix on all keys

app/Http/Middleware/Api/Application/AuthenticateApplicationUser.php

@@ -16,7 +16,9 @@ class AuthenticateApplicationUser
      */
     public function handle(Request $request, Closure $next)
     {
-        if (is_null($request->user()) || !$request->user()->root_admin) {
+        /** @var \Pterodactyl\Models\User|null $user */
+        $user = $request->user();
+        if (!$user || !$user->root_admin) {
             throw new AccessDeniedHttpException('This account does not have permission to access the API.');
         }