Phase 3: embed web UI with go:embed, pinned TypeScript toolchain, drop i18n, add /healthz

- html/embed.go embeds html/ (pages, css, img, js, video); src/assets.go
  serves it, with os.DirFS("html") under -dev. Static assets get an ETag
  and Cache-Control: no-cache; HTML pages are still templated (only the
  login error message is substituted now).
- Delete the generated src/webUI.go (783 KB base64), src/html-build.go and
  cmd/webui-gen; Dockerfile no longer runs a generator.
- Language layer removed: 254 {{.x}} placeholders inlined as English
  strings in ts/*.ts and the two auth pages; html/lang/en.json, the
  LanguageUI struct and the 'language' setting are gone.
- ts/tsconfig.json + package.json pin typescript 5.9.3; the seven sources
  compile (ES2020, global scripts) into one committed html/js/app.js.
  Ten unreferenced legacy scripts under html/js/ deleted; all pages load
  js/app.js.
- Fix the six type errors that blocked a clean compile, including a real
  bug: a missing semicolon in the search shortcut handler made the code
  call the result of preventDefault(), so the shortcut threw instead of
  focusing the search box.
- /healthz liveness endpoint; Dockerfile healthcheck and README use it.
- Drone: go vet, and a webui-check step that rebuilds the bundle and fails
  if the committed app.js is stale.
- README-DEV.md documents build, UI toolchain, -dev, versioning, CI.

ts/base_ts.ts

@@ -11,22 +11,22 @@ var LAST_BULK_CHECKBOX:HTMLInputElement = null
 
 // Menü
 var menuItems = new Array()
-menuItems.push(new MainMenuItem("playlist", "{{.mainMenu.item.playlist}}", "m3u.png", "{{.mainMenu.headline.playlist}}"))
-//menuItems.push(new MainMenuItem("pmsID", "{{.mainMenu.item.pmsID}}", "number.png", "{{.mainMenu.headline.pmsID}}"))
-menuItems.push(new MainMenuItem("filter", "{{.mainMenu.item.filter}}", "filter.png", "{{.mainMenu.headline.filter}}"))
-menuItems.push(new MainMenuItem("xmltv", "{{.mainMenu.item.xmltv}}", "xmltv.png", "{{.mainMenu.headline.xmltv}}"))
-menuItems.push(new MainMenuItem("mapping", "{{.mainMenu.item.mapping}}", "mapping.png", "{{.mainMenu.headline.mapping}}"))
-menuItems.push(new MainMenuItem("users", "{{.mainMenu.item.users}}", "users.png", "{{.mainMenu.headline.users}}"))
-menuItems.push(new MainMenuItem("settings", "{{.mainMenu.item.settings}}", "settings.png", "{{.mainMenu.headline.settings}}"))
-menuItems.push(new MainMenuItem("log", "{{.mainMenu.item.log}}", "log.png", "{{.mainMenu.headline.log}}"))
-menuItems.push(new MainMenuItem("logout", "{{.mainMenu.item.logout}}", "logout.png", "{{.mainMenu.headline.logout}}"))
+menuItems.push(new MainMenuItem("playlist", "Playlist", "m3u.png", "Local or remote playlists"))
+//menuItems.push(new MainMenuItem("pmsID", "PMS ID", "number.png", ""))
+menuItems.push(new MainMenuItem("filter", "Filter", "filter.png", "Filter playlist"))
+menuItems.push(new MainMenuItem("xmltv", "XMLTV", "xmltv.png", "Local or remote XMLTV files"))
+menuItems.push(new MainMenuItem("mapping", "Mapping", "mapping.png", "Map playlist channels to EPG channels"))
+menuItems.push(new MainMenuItem("users", "Users", "users.png", "User management"))
+menuItems.push(new MainMenuItem("settings", "Settings", "settings.png", "Settings"))
+menuItems.push(new MainMenuItem("log", "Log", "log.png", "Log"))
+menuItems.push(new MainMenuItem("logout", "Logout", "logout.png", "Logout"))
 
 // Kategorien für die Einstellungen
 var settingsCategory = new Array()
-settingsCategory.push(new SettingsCategoryItem("{{.settings.category.general}}", "tuner,epgSource,api,use_plexAPI,plex.url,plex.token"));settingsCategory.push(new SettingsCategoryItem("{{.settings.category.files}}", "update,files.update,temp.path,cache.images,xepg.missing.epg.mode,xepg.replace.missing.images"))
-settingsCategory.push(new SettingsCategoryItem("{{.settings.category.streaming}}", "buffer,udpxy,buffer.size.kb,buffer.timeout,user.agent,ffmpeg.path,ffmpeg.options,vlc.path,vlc.options"))
-settingsCategory.push(new SettingsCategoryItem("{{.settings.category.backup}}", "backup.path,backup.keep"))
-settingsCategory.push(new SettingsCategoryItem("{{.settings.category.authentication}}", "authentication.web,authentication.pms,authentication.m3u,authentication.xml,authentication.api"))
+settingsCategory.push(new SettingsCategoryItem("General", "tuner,epgSource,api,use_plexAPI,plex.url,plex.token"));settingsCategory.push(new SettingsCategoryItem("Files", "update,files.update,temp.path,cache.images,xepg.missing.epg.mode,xepg.replace.missing.images"))
+settingsCategory.push(new SettingsCategoryItem("Streaming", "buffer,udpxy,buffer.size.kb,buffer.timeout,user.agent,ffmpeg.path,ffmpeg.options,vlc.path,vlc.options"))
+settingsCategory.push(new SettingsCategoryItem("Backup", "backup.path,backup.keep"))
+settingsCategory.push(new SettingsCategoryItem("Authentication", "authentication.web,authentication.pms,authentication.m3u,authentication.xml,authentication.api"))
 
 function showPopUpElement(elm) {
 
@@ -342,7 +342,7 @@ function sortTable(column) {
         default: console.log(x.childNodes[0].tagName);
       }
 
-      if (xValue == "" || xValue == NaN) {
+      if (xValue == "" || Number.isNaN(xValue)) {
 
         xValue = i
         sortObj[i] = rows[i];
@@ -502,7 +502,7 @@ function changeChannelNumber(element) {
   var channels = getObjKeys(data)
 
   if (isNaN(newNumber)) {
-    alert("{{.alert.invalidChannelNumber}}")
+    alert("Invalid channel number")
     return
   }
 
@@ -628,7 +628,7 @@ function restore() {
   restore.onchange = function() {
 
     var filename = (restore as HTMLInputElement).files[0].name
-    var check = confirm("File: " + filename + "\n{{.confirm.restore}}");
+    var check = confirm("File: " + filename + "\nAll data will be replaced with those from the backup. Should the files be restored?");
 
     if (check == true) {