ci: fix bun publish authentication using NPM_CONFIG_TOKEN

- Remove unnecessary .npmrc configuration step

- Use NPM_CONFIG_TOKEN instead of NODE_AUTH_TOKEN for bun publish

- Bun requires NPM_CONFIG_TOKEN environment variable for npm auth

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-opencode)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

Author: gracefullight

.github/workflows/release.yml

@@ -80,7 +80,7 @@ jobs:
             fi
           done
         env:
-          NODE_AUTH_TOKEN: ${{ secrets.NPM_TOKEN }}
+          NPM_CONFIG_TOKEN: ${{ secrets.NPM_TOKEN }}
 
   publish-dart:
     needs: release-please