Add workflow_dispatch trigger to release.yml

Allows manually triggering app releases from the Gitea Actions UI.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

.gitea/workflows/release.yml

@@ -9,6 +9,7 @@ on:
       - 'package.json'
       - 'vite.config.ts'
       - 'index.html'
+  workflow_dispatch:
 
 jobs:
   test: