fix(ci): push release commit with RELEASE_TOKEN

The built-in GITHUB_TOKEN is rejected by branch protection on main.
Use the Gitea bot's RELEASE_TOKEN, which may bypass it.

Closes #41

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -24,7 +24,7 @@ jobs:
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
-          token: ${{ secrets.GITHUB_TOKEN }}
+          token: ${{ secrets.RELEASE_TOKEN }}
 
       - name: Validate version and Unreleased section
         run: |