Replace rsync with tar+SSH due to server permission issues

- Test rsync availability on remote host
- Use tar + SSH pipe as alternative deployment method
- Avoids rsync server permission denied errors
- More reliable for Synology NAS deployment

Resolves: Permission denied on rsync server command execution

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

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

.github/workflows/deploy.yml

@@ -41,10 +41,15 @@ jobs:
           ssh -p ${{ secrets.NAS_PORT }} admin@${{ secrets.NAS_HOST }} \
             "mkdir -p /volume1/homes/admin/nginx-infra && ls -la /volume1/homes/admin/nginx-infra"
 
-      - name: Rsync to NAS (with verbose SSH)
+      - name: Test rsync availability
         run: |
-          rsync -avz -e "ssh -vvv -p ${{ secrets.NAS_PORT }}" ./ \
-            admin@${{ secrets.NAS_HOST }}:/volume1/homes/admin/nginx-infra/
+          ssh -p ${{ secrets.NAS_PORT }} admin@${{ secrets.NAS_HOST }} \
+            "which rsync && rsync --version"
+
+      - name: Alternative deployment via tar and SSH
+        run: |
+          tar czf - . | ssh -p ${{ secrets.NAS_PORT }} admin@${{ secrets.NAS_HOST }} \
+            "cd /volume1/homes/admin/nginx-infra && tar xzf -"
 
       - name: Remote docker-compose up
         run: |