fix(go): repair migration wire contracts and runtime lifecycle; document incomplete port

internal/config/config.go

@@ -8,6 +8,7 @@ import (
 )
 
 type Config struct {
+	Login   LoginSettings `json:"login"`
 	Client  ClientConfig  `json:"client"`
 	Network NetworkConfig `json:"network"`
 	Admin   AdminConfig   `json:"admin"`
@@ -117,6 +118,9 @@ func LoadConfig(path string) (*Config, error) {
 		return nil, fmt.Errorf("failed to parse json config from %s: %w", absPath, err)
 	}
 
+	if cfg.Login.RoleListMode == "" {
+		cfg.Login.RoleListMode = "list"
+	}
 	// Apply default values if omitted
 	if cfg.Network.BindHost == "" {
 		cfg.Network.BindHost = "0.0.0.0"