Fix app icon: use rcedit afterPack hook to embed custom icon in EXE

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

package.json

@@ -1,6 +1,6 @@
 {
   "name": "real-debrid-downloader",
-  "version": "1.5.48",
+  "version": "1.5.49",
   "description": "Real-Debrid Downloader Desktop (Electron + React + TypeScript)",
   "main": "build/main/main/main.js",
   "author": "Sucukdeluxe",
@@ -36,6 +36,7 @@
     "cross-env": "^7.0.3",
     "electron": "^31.7.7",
     "electron-builder": "^25.1.8",
+    "rcedit": "^5.0.2",
     "tsup": "^8.3.6",
     "tsx": "^4.19.2",
     "typescript": "^5.7.3",
@@ -72,6 +73,7 @@
       "perMachine": false,
       "allowToChangeInstallationDirectory": true,
       "createDesktopShortcut": true
-    }
+    },
+    "afterPack": "scripts/afterPack.cjs"
   }
 }