refactor: rename EnableCoverArtUpload to EnableArtworkUpload

The config flag gates all image uploads (artists, radios, playlists),
not just cover art. Rename it to accurately reflect its scope across
the backend config, native API permission check, Subsonic CoverArtRole,
serve_index JSON key, and frontend config.

server/nativeapi/image_upload.go

@@ -24,8 +24,8 @@ const maxImageSize = 10 << 20 // 10MB
 
 func checkImageUploadPermission(w http.ResponseWriter, r *http.Request) bool {
 	user, _ := request.UserFrom(r.Context())
-	if !conf.Server.EnableCoverArtUpload && !user.IsAdmin {
-		http.Error(w, "cover art upload is disabled", http.StatusForbidden)
+	if !conf.Server.EnableArtworkUpload && !user.IsAdmin {
+		http.Error(w, "artwork upload is disabled", http.StatusForbidden)
 		return false
 	}
 	return true

server/nativeapi/playlists_test.go

@@ -28,8 +28,8 @@ var _ = Describe("Playlist Image Endpoints", func() {
 	})
 
 	DescribeTable("uploadPlaylistImage guard",
-		func(enableCoverArtUpload, isAdmin bool, expectedStatus int) {
-			conf.Server.EnableCoverArtUpload = enableCoverArtUpload
+		func(enableArtworkUpload, isAdmin bool, expectedStatus int) {
+			conf.Server.EnableArtworkUpload = enableArtworkUpload
 			handler := uploadPlaylistImage(&mockPlaylistsService{})
 
 			req := httptest.NewRequest("POST", "/playlist/pls-1/image", nil)
@@ -47,8 +47,8 @@ var _ = Describe("Playlist Image Endpoints", func() {
 	)
 
 	DescribeTable("deletePlaylistImage guard",
-		func(enableCoverArtUpload, isAdmin bool, expectedStatus int) {
-			conf.Server.EnableCoverArtUpload = enableCoverArtUpload
+		func(enableArtworkUpload, isAdmin bool, expectedStatus int) {
+			conf.Server.EnableArtworkUpload = enableArtworkUpload
 			handler := deletePlaylistImage(&mockPlaylistsService{})
 
 			req := httptest.NewRequest("DELETE", "/playlist/pls-1/image", nil)

server/serve_index.go

@@ -61,7 +61,7 @@ func serveIndex(ds model.DataStore, fs fs.FS, shareInfo *model.Share) http.Handl
 			"losslessFormats":           strings.ToUpper(strings.Join(mime.LosslessFormats, ",")),
 			"devActivityPanel":          conf.Server.DevActivityPanel,
 			"enableUserEditing":         conf.Server.EnableUserEditing,
-			"enableCoverArtUpload":      conf.Server.EnableCoverArtUpload,
+			"enableArtworkUpload":       conf.Server.EnableArtworkUpload,
 			"enableSharing":             conf.Server.EnableSharing,
 			"shareURL":                  conf.Server.ShareURL,
 			"defaultDownloadableShare":  conf.Server.DefaultDownloadableShare,

server/subsonic/users.go

@@ -22,7 +22,7 @@ func buildUserResponse(user model.User) responses.User {
 		ScrobblingEnabled: true,
 		DownloadRole:      conf.Server.EnableDownloads,
 		ShareRole:         conf.Server.EnableSharing,
-		CoverArtRole:      conf.Server.EnableCoverArtUpload || user.IsAdmin,
+		CoverArtRole:      conf.Server.EnableArtworkUpload || user.IsAdmin,
 		Folder:            slice.Map(user.Libraries, func(lib model.Library) int32 { return int32(lib.ID) }),
 	}
 

server/subsonic/users_test.go

@@ -105,8 +105,8 @@ var _ = Describe("Users", func() {
 	)
 
 	DescribeTable("CoverArt role permissions",
-		func(enableCoverArtUpload, isAdmin, expectedCoverArtRole bool) {
-			conf.Server.EnableCoverArtUpload = enableCoverArtUpload
+		func(enableArtworkUpload, isAdmin, expectedCoverArtRole bool) {
+			conf.Server.EnableArtworkUpload = enableArtworkUpload
 			testUser.IsAdmin = isAdmin
 
 			response := buildUserResponse(testUser)