Add WordPress.org plugin deploy GitHub Action (#8)

* Add WordPress.org plugin deploy GitHub Action

- Add .github/workflows/deploy.yml for automated deployment on release
- Add .wordpress-org folder with screenshot assets
- Add .distignore to exclude development files from deployment

Uses 10up/action-wordpress-plugin-deploy to deploy to WordPress.org SVN
when a new release is published. Also generates and attaches a ZIP file
to the GitHub release.

Co-Authored-By: yoren@shikadigital.co.jp <yorenchang@gmail.com>

* Improve workflow security and update deprecated action

- Add explicit permissions block for least privilege
- Replace deprecated actions/upload-release-asset@v1 with gh release upload

Co-Authored-By: yoren@shikadigital.co.jp <yorenchang@gmail.com>

---------

Co-authored-by: Devin AI <158243242+devin-ai-integration[bot]@users.noreply.github.com>
Co-authored-by: yoren@shikadigital.co.jp <yorenchang@gmail.com>

Author: devin-ai-integration[bot]

.distignore

@@ -0,0 +1,6 @@
+/.wordpress-org
+/.git
+/.github
+.gitignore
+.distignore
+.DS_Store

.github/workflows/deploy.yml

@@ -0,0 +1,31 @@
+name: Deploy to WordPress.org
+
+on:
+  release:
+    types: [published]
+
+permissions:
+  contents: write
+
+jobs:
+  deploy:
+    name: Deploy to WordPress.org
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v4
+
+      - name: WordPress Plugin Deploy
+        id: deploy
+        uses: 10up/action-wordpress-plugin-deploy@stable
+        with:
+          generate-zip: true
+        env:
+          SVN_USERNAME: ${{ secrets.SVN_USERNAME }}
+          SVN_PASSWORD: ${{ secrets.SVN_PASSWORD }}
+          SLUG: media-search-enhanced
+
+      - name: Upload release asset
+        run: gh release upload ${{ github.event.release.tag_name }} "${{ steps.deploy.outputs.zip-path }}" --clobber
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}