fix(i18n): use official github_token input parameter

Replace custom GH_TOKEN env with official github_token input:
- github_token is the official parameter per action.yml
- Action automatically sets GITHUB_TOKEN and GH_TOKEN internally
- Remove unnecessary use_oauth parameter

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

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

.github/workflows/translate-i18n-claude.yml

@@ -101,11 +101,9 @@ jobs:
       - name: Run Claude Code for Translation Sync
         if: steps.detect_changes.outputs.CHANGED_FILES != ''
         uses: anthropics/claude-code-action@v1
-        env:
-          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           anthropic_api_key: ${{ secrets.ANTHROPIC_API_KEY }}
-          use_oauth: false
+          github_token: ${{ secrets.GITHUB_TOKEN }}
           timeout_minutes: 55
           prompt: |
             You are a professional i18n synchronization engineer for the Dify project.