Use OAuth token instead of API key in claude-easy-fixes workflow

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

Author: ondrejmirtes

.github/workflows/claude-easy-fixes.yml

@@ -236,7 +236,7 @@ jobs:
 
       - name: "Run Claude Code"
         env:
-          ANTHROPIC_API_KEY: ${{ secrets.ANTHROPIC_API_KEY }}
+          CLAUDE_CODE_OAUTH_TOKEN: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
           GH_TOKEN: ${{ secrets.PHPSTAN_BOT_TOKEN }}
         run: |
           git config user.name "phpstan-bot"