fix: use /bin/rm explicitly in removePool so sudoers path matches

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01LP9Q4kfCAYAjJnsbHBrViZ

panel/lib/PHPManager.php

@@ -48,9 +48,7 @@ php_value[max_execution_time]  = 30
     public static function removePool(string $username): void {
         foreach (['7.4','8.1','8.2','8.3'] as $ver) {
             $file = str_replace('{ver}', $ver, self::$poolDir) . "/{$username}.conf";
-            // Always attempt removal — don't rely on file_exists() which fails when
-            // www-data can't read the pool.d directory; rm -f is a no-op if missing
-            shell_exec("sudo rm -f " . escapeshellarg($file) . " 2>/dev/null");
+            shell_exec("sudo /bin/rm -f " . escapeshellarg($file) . " 2>/dev/null");
             self::reloadFPM($ver);
         }
     }