feat(phase1): rebrand to TTRPG Player and drop Git updates feed

Rename product to TTRPG Player (TTRPGPlayer / com.ttrpgplayer.app), use .ttrpg.zip for new saves while keeping .dnd.zip import, accept TTRPG- and DND- license keys on client, and remove sync-update-feed plus CI push to DndGamePlayerUpdates.

Co-authored-by: Cursor <cursoragent@cursor.com>

app/main/update/installAutoUpdater.ts

@@ -1,6 +1,7 @@
 import { app, dialog } from 'electron';
 import { autoUpdater } from 'electron-updater';
 
+import { appDisplayNameForLocale } from '../../shared/appBranding';
 import {
   ipcChannels,
   type UpdaterCheckResponse,
@@ -110,7 +111,7 @@ export function installAutoUpdater(licenseService: LicenseService, register: Reg
     void dialog
       .showMessageBox({
         type: 'info',
-        title: 'DNDGamePlayer',
+        title: appDisplayNameForLocale(app.getLocale()),
         message: `Доступна новая версия ${info.version}. Установить и перезапустить?`,
         buttons: ['Перезапустить сейчас', 'Позже'],
         defaultId: 0,