fix: disable prepared statements for PgBouncer compatibility

Add PDO::ATTR_EMULATE_PREPARES option to prevent "cached plan must not
change result type" errors during rolling deployments with PgBouncer.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

config/database.php

@@ -48,6 +48,9 @@
             'prefix_indexes' => true,
             'search_path' => 'public',
             'sslmode' => 'prefer',
+            'options' => [
+                PDO::ATTR_EMULATE_PREPARES => true,
+            ],
         ],
 
         'testing' => [