Fix: register D2R resolution profiles with engine, fix null API responses

pkg/api/api.go

@@ -333,7 +333,7 @@ func (s *Server) handleLootRules(w http.ResponseWriter, r *http.Request) {
 func (s *Server) handleRoutines(w http.ResponseWriter, r *http.Request) {
 	routines := s.engine.GamePlugin().Routines()
 	
-	var response []map[string]interface{}
+	response := make([]map[string]interface{}, 0)
 	for _, routine := range routines {
 		response = append(response, map[string]interface{}{
 			"name":  routine.Name(),
@@ -475,7 +475,7 @@ func (s *Server) getRegions() []RegionInfo {
 	profile, err := registry.Get(gameID, width, height)
 	if err != nil {
 		log.Printf("Failed to get resolution profile: %v", err)
-		return nil
+		return make([]RegionInfo, 0)
 	}
 	
 	var regions []RegionInfo

pkg/engine/engine.go

@@ -61,6 +61,18 @@ func NewEngine(captureSource capture.Source, gamePlugin plugin.Plugin, devMode b
 		startTime:         time.Now(),
 	}
 	
+	// Register game-specific resolution profiles with the engine's registry.
+	// Plugins that support resolution profiles implement this optional interface.
+	type profileRegistrar interface {
+		RegisterResolutionProfiles(*resolution.Registry) error
+	}
+	if registrar, ok := gamePlugin.(profileRegistrar); ok {
+		if err := registrar.RegisterResolutionProfiles(engine.resolutionRegistry); err != nil {
+			return nil, fmt.Errorf("failed to register resolution profiles: %w", err)
+		}
+		log.Printf("Registered resolution profiles for %s", gamePlugin.Info().ID)
+	}
+	
 	// Create engine services for the plugin
 	engine.services = &engineServices{engine: engine}