Wire up TUS protocol routes in filer server

Add TUS handler route (/.tus/) to the filer HTTP server.
The TUS route is registered before the catch-all route to ensure
proper routing of TUS protocol requests.

TUS protocol is now accessible at:
- OPTIONS /.tus/ - Capability discovery
- POST /.tus/{path} - Create upload
- HEAD /.tus/.uploads/{id} - Get offset
- PATCH /.tus/.uploads/{id} - Upload data
- DELETE /.tus/.uploads/{id} - Cancel upload

weed/server/filer_server.go

@@ -195,6 +195,8 @@ func NewFilerServer(defaultMux, readonlyMux *http.ServeMux, option *FilerOption)
 	handleStaticResources(defaultMux)
 	if !option.DisableHttp {
 		defaultMux.HandleFunc("/healthz", requestIDMiddleware(fs.filerHealthzHandler))
+		// TUS resumable upload protocol handler
+		defaultMux.HandleFunc("/.tus/", fs.filerGuard.WhiteList(requestIDMiddleware(fs.tusHandler)))
 		defaultMux.HandleFunc("/", fs.filerGuard.WhiteList(requestIDMiddleware(fs.filerHandler)))
 	}
 	if defaultMux != readonlyMux {