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/license/licenseService.ts

@@ -7,7 +7,7 @@ import { ipcChannels } from '../../shared/ipc/contracts';
 import { EULA_CURRENT_VERSION } from '../../shared/license/eulaVersion';
 import type { LicenseSnapshot } from '../../shared/license/licenseSnapshot';
 import type { LicensePayloadV1 } from '../../shared/license/payloadV1';
-import { isDndProductKey } from '../../shared/license/productKey';
+import { isProductKey } from '../../shared/license/productKey';
 import { normalizeLicenseTokenInput } from '../../shared/license/tokenFormat';
 
 import { getOrCreateDeviceId } from './deviceId';
@@ -87,7 +87,7 @@ export class LicenseService {
   private deriveFallbackKey(): Buffer {
     return crypto
       .createHash('sha256')
-      .update('DNDGamePlayer.license.fallback.v1\0', 'utf8')
+      .update('TTRPGPlayer.license.fallback.v1\0', 'utf8')
       .update(this.deviceId, 'utf8')
       .digest();
   }
@@ -342,7 +342,7 @@ export class LicenseService {
       return this.getStatusSync();
     }
     let trimmed = normalizeLicenseTokenInput(token);
-    if (isDndProductKey(trimmed)) {
+    if (isProductKey(trimmed)) {
       trimmed = await this.activateWithProductKey(trimmed);
     }
     const nowSec = Math.floor(Date.now() / 1000);