fix: 修复TG通知workflow语法错误

- 移除if条件中对secrets的直接引用（GitHub Actions不支持）
- 改用shell脚本内部检查环境变量是否存在

.github/workflows/release.yml

@@ -146,12 +146,17 @@ jobs:
 
       # Send Telegram notification
       - name: Send Telegram Notification
-        if: ${{ secrets.TELEGRAM_BOT_TOKEN != '' && secrets.TELEGRAM_CHAT_ID != '' }}
         env:
           TELEGRAM_BOT_TOKEN: ${{ secrets.TELEGRAM_BOT_TOKEN }}
           TELEGRAM_CHAT_ID: ${{ secrets.TELEGRAM_CHAT_ID }}
         continue-on-error: true
         run: |
+          # 检查必要的环境变量
+          if [ -z "$TELEGRAM_BOT_TOKEN" ] || [ -z "$TELEGRAM_CHAT_ID" ]; then
+            echo "Telegram credentials not configured, skipping notification"
+            exit 0
+          fi
+
           TAG_NAME=${GITHUB_REF#refs/tags/}
           VERSION=${TAG_NAME#v}
           REPO="${{ github.repository }}"