ci: add GitHub Actions deploy workflow for plugin

Deploys plugin files to Hostinger via rsync on push to main,
matching the theme repo's CI/CD pattern.

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

peptide-news-plugin/.github/workflows/deploy.yml

@@ -0,0 +1,46 @@
+name: Deploy Plugin to Hostinger
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  deploy:
+    name: Deploy to Production
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: Setup SSH key
+        run: |
+          mkdir -p ~/.ssh
+          echo "${{ secrets.SSH_PRIVATE_KEY }}" > ~/.ssh/deploy_key
+          chmod 600 ~/.ssh/deploy_key
+          ssh-keyscan -p ${{ secrets.SSH_PORT }} ${{ secrets.SSH_HOST }} >> ~/.ssh/known_hosts 2>/dev/null
+
+      - name: Deploy via rsync
+        run: |
+          rsync -avz --delete \
+            --exclude='.git' \
+            --exclude='.github' \
+            -e "ssh -i ~/.ssh/deploy_key -p ${{ secrets.SSH_PORT }} -o StrictHostKeyChecking=no" \
+            ./peptide-news-plugin/ ${{ secrets.SSH_USERNAME }}@${{ secrets.SSH_HOST }}:/home/${{ secrets.SSH_USERNAME }}/domains/peptiderepo.com/public_html/wp-content/plugins/peptide-news/
+
+      - name: Purge LiteSpeed Cache
+        run: |
+          ssh -i ~/.ssh/deploy_key -p ${{ secrets.SSH_PORT }} -o StrictHostKeyChecking=no \
+            ${{ secrets.SSH_USERNAME }}@${{ secrets.SSH_HOST }} << 'ENDSSH'
+            CACHE_DIR="/home/${{ secrets.SSH_USERNAME }}/domains/peptiderepo.com/public_html/wp-content/litespeed"
+            if [ -d "$CACHE_DIR" ]; then
+              rm -rf "$CACHE_DIR"/*
+              echo "LiteSpeed cache purged."
+            fi
+            touch "/home/${{ secrets.SSH_USERNAME }}/domains/peptiderepo.com/public_html/.lscache_purge" 2>/dev/null || true
+            echo "Cache purge signal sent."
+          ENDSSH
+
+      - name: Cleanup
+        if: always()
+        run: rm -f ~/.ssh/deploy_key