Add Siti Delivery Time Notices plugin and related functionality

- Create main plugin file with metadata and initialization logic.
- Implement SitiDeliveryTimeNotice class for managing delivery time settings.
- Add JavaScript for updating delivery time notices on product pages.
- Update GitHub Actions workflow to reflect new file structure.
- Remove deprecated master-file.php.

.gitea/workflows/release.yml

@@ -9,7 +9,7 @@ on:
   push:
     branches: [ main ]
     paths:
-      - 'master-file.php'
+      - 'siti-delivery-time-notices.php'
       - 'includes/**'
       - 'assets/**'
       - 'languages/**'
@@ -18,8 +18,8 @@ jobs:
   release:
     uses: roberto/ci-workflows/.gitea/workflows/wp-plugin-release.yml@c6393ed47258d6f040ceeed3994b17b7faa3ef23
     with:
-      main_file: master-file.php
-      slug: siti-plugin-template
+      main_file: siti-delivery-time-notices.php
+      slug: siti-delivery-time-notices
       release_body: ${{ github.event_name == 'workflow_dispatch' && github.event.inputs.release_notes || '' }}
     secrets:
       RELEASE_TOKEN: ${{ secrets.RELEASE_TOKEN }}