refactor(policy): namespace signature_flow system config key

Signed-off-by: Vitor Mattos <1079143+vitormattos@users.noreply.github.com>

Author: vitormattos

lib/Service/Policy/Provider/Signature/SignatureFlowPolicy.php

@@ -17,6 +17,7 @@
 
 final class SignatureFlowPolicy implements IPolicyDefinitionProvider {
 	public const KEY = 'signature_flow';
+	public const SYSTEM_APP_CONFIG_KEY = 'policy.signature_flow.system';
 
 	#[\Override]
 	public function keys(): array {
@@ -47,6 +48,7 @@ public function get(string|\BackedEnum $policyKey): IPolicyDefinition {
 
 					return $rawValue;
 				},
+				appConfigKey: self::SYSTEM_APP_CONFIG_KEY,
 			),
 			default => throw new \InvalidArgumentException('Unknown policy key: ' . $this->normalizePolicyKey($policyKey)),
 		};