Fix PgBouncer admin console: enable PDO emulated prepares

PgBouncer admin console does not support extended query protocol
(prepared statements). Setting PDO::ATTR_EMULATE_PREPARES = true
forces PDO to use simple query protocol for SHOW commands.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Controller/AdminController.php

@@ -981,7 +981,10 @@ class AdminController extends AbstractController
                 "pgsql:host={$host};port={$port};dbname=pgbouncer",
                 $user,
                 $pass,
-                [\PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION],
+                [
+                    \PDO::ATTR_ERRMODE => \PDO::ERRMODE_EXCEPTION,
+                    \PDO::ATTR_EMULATE_PREPARES => true,
+                ],
             );
 
             $pools = $pdo->query('SHOW POOLS')->fetchAll(\PDO::FETCH_ASSOC);