Bump version to 0.6.3, temporarily disable release CI

Disable release workflow trigger to prevent duplicate builds
when tagging manually with pre-built binaries.

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

.gitea/workflows/release.yml

@@ -3,7 +3,7 @@ name: Build & Release
 on:
   push:
     tags:
-      - 'v*'
+      - 'disabled-v*'
 
 jobs:
   release: