fix: enable createUpdaterArtifacts for updater signing

Add createUpdaterArtifacts: true to bundle config — required for
Tauri v2 to generate .sig files and latest.json in releases.
Also fix invalid updaterJsonKeepUniversal → updaterJsonPreferNsis.

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

Author: marcelopepis

.github/workflows/release.yml

@@ -73,4 +73,4 @@ jobs:
             _Changelog completo em breve._
           releaseDraft: false
           prerelease: false
-          updaterJsonKeepUniversal: true
+          updaterJsonPreferNsis: true

src-tauri/tauri.conf.json

@@ -41,6 +41,7 @@
   "bundle": {
     "active": true,
     "targets": "all",
+    "createUpdaterArtifacts": true,
     "icon": [
       "icons/32x32.png",
       "icons/128x128.png",