fix: use PAT_TOKEN for releases to trigger Discord notifications

- release.yml: Use PAT_TOKEN instead of GITHUB_TOKEN for softprops/action-gh-release
  so the published event triggers downstream workflows (Discord notification)
- discord-release.yml: Add workflow_dispatch trigger for manual re-runs

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

.github/workflows/discord-release.yml

@@ -3,6 +3,7 @@ name: Discord Release Notification
 on:
   release:
     types: [published]
+  workflow_dispatch:
 
 jobs:
   discord-notification:

.github/workflows/release.yml

@@ -620,7 +620,7 @@ jobs:
           draft: false
           prerelease: ${{ contains(github.ref, 'beta') || contains(github.ref, 'alpha') }}
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GITHUB_TOKEN: ${{ secrets.PAT_TOKEN || secrets.GITHUB_TOKEN }}
 
   # Update README with new version after successful release
   update-readme: