feat: add dependency shutdown and configurable service endpoints

response/encoder.go

@@ -16,6 +16,9 @@ type Result struct {
 	Err                      error
 	BusinessCode             any
 	Failed                   bool
+	// PreserveStatus keeps an explicit protocol status through catalog mapping
+	// and HTTP output (for example, readiness must remain 503 when unhealthy).
+	PreserveStatus bool
 }
 
 // IsError preserves failure semantics independently of the HTTP status.