🧪 test: implement comprehensive BDD test suite for JWT secret rotation

- Added JWT secret rotation feature tests
- Implemented config management BDD steps
- Created greet service BDD scenarios
- Enhanced test server with JWT rotation support
- Added comprehensive step definitions

Generated by Mistral Vibe.
Co-Authored-By: Mistral Vibe <vibe@mistral.ai>

pkg/bdd/suite.go

@@ -30,6 +30,8 @@ func InitializeTestSuite(ctx *godog.TestSuiteContext) {
 			}
 			sharedServer.Stop()
 		}
+		// Cleanup any test config files
+		steps.CleanupAllTestConfigFiles()
 	})
 }