feat: remove licensing system and bump version to 4.0.0-cloudhost

- Remove AS3CF_Pro_Licences_Updates instantiation and all $this->licence
  references from the PHP backend; stub methods return safe defaults
  (is_valid_licence → true, is_licence_over_media_limit → false,
  feature_enabled → true, is_pro_plugin_setup bypasses licence check)
- Remove Licences REST API endpoint from add_api_endpoints()
- Remove 'licence' from allowed settings keys
- Bump version from 3.2.12 to 4.0.0-cloudhost in version.php and plugin header
- Replace licence derived store with hardcoded always-valid writable store
- Simplify enableAssets store to depend only on config.assets_settings
- Remove licence panel row from Nav flyout; remove licence check from
  offload remaining button disabled logic
- Replace Header licence display with "Internal Build" label
- Remove LicencePage route registration from pages.js; drop licence
  import and is_valid guards from all isNextRoute functions
- Rebuild compiled Svelte bundle

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

amazon-s3-and-cloudfront-pro.php

@@ -5,7 +5,7 @@ Plugin URI: https://deliciousbrains.com/wp-offload-media/
 Update URI: https://deliciousbrains.com/wp-offload-media/
 Description: Speed up your WordPress site by offloading your media and assets to Amazon S3, DigitalOcean Spaces or Google Cloud Storage and a CDN.
 Author: Delicious Brains
-Version: 3.2.12
+Version: 4.0.0-cloudhost
 Author URI: https://deliciousbrains.com/
 Update URI: false
 Network: True