feat(gallery): image detail view

internal/handlers/restgallery/resource.go

@@ -28,12 +28,16 @@ func New(renderer renderer, srv galleryService, cfg *config.Gallery) *Handler {
 		cfg:     cfg,
 	}
 
-	mux.HandleFunc(fmt.Sprintf("GET /%s", url.PathEscape(cfg.Path)), h.gallery)
+	galleryPath := url.PathEscape(cfg.Path)
+
+	mux.HandleFunc(fmt.Sprintf("GET /%s/{image_uid}", galleryPath), h.image)
+	mux.HandleFunc(fmt.Sprintf("GET /%s", galleryPath), h.gallery)
 	return h
 }
 
 type galleryService interface {
 	GetGallerySet(ctx context.Context) (gallerySet gallery.Set, err error)
+	GetPrevAndNext(ctx context.Context, uid string) (previous *gallery.Image, next *gallery.Image, err error)
 }
 type renderer interface {
 	Render(ctx context.Context, w io.Writer, r *http.Request, component templ.Component)