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/shared/project/projectZipExtension.ts

@@ -0,0 +1,52 @@
+/** Текущий формат архива проекта (новые сохранения). */
+export const PROJECT_ZIP_EXTENSION = '.ttrpg.zip';
+
+/** Устаревший формат — только открытие / импорт (вариант B). */
+export const PROJECT_ZIP_EXTENSION_LEGACY = '.dnd.zip';
+
+export function isProjectZipFileName(fileName: string): boolean {
+  const lower = fileName.toLowerCase();
+  return lower.endsWith(PROJECT_ZIP_EXTENSION) || lower.endsWith(PROJECT_ZIP_EXTENSION_LEGACY);
+}
+
+export function isLegacyProjectZipFileName(fileName: string): boolean {
+  return fileName.toLowerCase().endsWith(PROJECT_ZIP_EXTENSION_LEGACY);
+}
+
+export function projectZipFileNameFromBase(stem: string): string {
+  return `${stem}${PROJECT_ZIP_EXTENSION}`;
+}
+
+/** Имя файла для сохранения/экспорта — всегда `.ttrpg.zip`. */
+export function normalizeSaveProjectZipPath(filePath: string): string {
+  const lower = filePath.toLowerCase();
+  if (lower.endsWith(PROJECT_ZIP_EXTENSION)) return filePath;
+  if (lower.endsWith(PROJECT_ZIP_EXTENSION_LEGACY)) {
+    return filePath.slice(0, -PROJECT_ZIP_EXTENSION_LEGACY.length) + PROJECT_ZIP_EXTENSION;
+  }
+  if (lower.endsWith('.zip')) {
+    return filePath.replace(/\.zip$/iu, PROJECT_ZIP_EXTENSION);
+  }
+  return `${filePath}${PROJECT_ZIP_EXTENSION}`;
+}
+
+export function stripProjectZipExtension(fileName: string): string {
+  const lower = fileName.toLowerCase();
+  if (lower.endsWith(PROJECT_ZIP_EXTENSION)) {
+    return fileName.slice(0, -PROJECT_ZIP_EXTENSION.length);
+  }
+  if (lower.endsWith(PROJECT_ZIP_EXTENSION_LEGACY)) {
+    return fileName.slice(0, -PROJECT_ZIP_EXTENSION_LEGACY.length);
+  }
+  return fileName;
+}
+
+export const PROJECT_ZIP_OPEN_DIALOG_FILTER: Electron.FileFilter = {
+  name: 'Проект TTRPG (*.ttrpg.zip, *.dnd.zip)',
+  extensions: ['ttrpg.zip', 'dnd.zip'],
+};
+
+export const PROJECT_ZIP_SAVE_DIALOG_FILTER: Electron.FileFilter = {
+  name: 'Проект TTRPG (*.ttrpg.zip)',
+  extensions: ['ttrpg.zip'],
+};