Switch Claude Code Review action to use API key

Change from CLAUDE_CODE_OAUTH_TOKEN to ANTHROPIC_API_KEY due to
OAuth token format issues with the GitHub Action.

See: anthropics/claude-code-action#727

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

Author: devondragon

.github/workflows/claude-code-review.yml

@@ -35,7 +35,7 @@ jobs:
         id: claude-review
         uses: anthropics/claude-code-action@v1
         with:
-          claude_code_oauth_token: ${{ secrets.CLAUDE_CODE_OAUTH_TOKEN }}
+          anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
           prompt: |
             REPO: ${{ github.repository }}
             PR NUMBER: ${{ github.event.pull_request.number }}