Move api authentication to under command, add Authentication plugin

lib/Pear/LocalLoop/Controller/Admin.pm

@@ -0,0 +1,18 @@
+package Pear::LocalLoop::Controller::Admin;
+use Mojo::Base 'Mojolicious::Controller';
+
+sub index {
+  my $c = shift;
+}
+
+sub under {
+  my $c = shift;
+
+  if ( $c->is_user_authenticated ) {
+    return 1 if defined $c->current_user->administrator;
+  }
+  $c->redirect_to('/');
+  return undef;
+}
+
+1;