Add Handy / Funscript support (#1377)

* Add funscript route to scenes

Adds a /scene/:id/funscript route which serves a funscript file, if present.

Current convention is that these are files stored with the same path, but with the extension ".funscript".

* Look for funscript during scan

This is stored in the Scene record and used to drive UI changes for funscript support.

Currently, that's limited to a funscript link in the Scene's file info.

* Add filtering and sorting for interactive
* Add Handy connection key to interface config
* Add Handy client and placeholder component.

Uses defucilis/thehandy, but not thehandy-react as I had difficulty integrating the context with the existing components.

Instead, the expensive calculation for the server time offset is put in localStorage for reuse.

A debounce was added when scrubbing the video, as otherwise it spammed the Handy API with updates to the current offset.

pkg/api/routes_scene.go

@@ -38,6 +38,7 @@ func (rs sceneRoutes) Routes() chi.Router {
 		r.Get("/preview", rs.Preview)
 		r.Get("/webp", rs.Webp)
 		r.Get("/vtt/chapter", rs.ChapterVtt)
+		r.Get("/funscript", rs.Funscript)
 
 		r.Get("/scene_marker/{sceneMarkerId}/stream", rs.SceneMarkerStream)
 		r.Get("/scene_marker/{sceneMarkerId}/preview", rs.SceneMarkerPreview)
@@ -255,6 +256,12 @@ func (rs sceneRoutes) ChapterVtt(w http.ResponseWriter, r *http.Request) {
 	_, _ = w.Write([]byte(vtt))
 }
 
+func (rs sceneRoutes) Funscript(w http.ResponseWriter, r *http.Request) {
+	scene := r.Context().Value(sceneKey).(*models.Scene)
+	funscript := utils.GetFunscriptPath(scene.Path)
+	utils.ServeFileNoCache(w, r, funscript)
+}
+
 func (rs sceneRoutes) VttThumbs(w http.ResponseWriter, r *http.Request) {
 	scene := r.Context().Value(sceneKey).(*models.Scene)
 	w.Header().Set("Content-Type", "text/vtt")