Implement version 0.0.1 - Licensed Product type for WooCommerce

Add complete plugin infrastructure for selling software with license keys:

- New "Licensed Product" WooCommerce product type
- License key generation (XXXX-XXXX-XXXX-XXXX format) on order completion
- Domain-based license validation system
- REST API endpoints (validate, status, activate, deactivate)
- Customer My Account "Licenses" page
- Admin license management under WooCommerce > Licenses
- Checkout domain field for licensed products
- Custom database tables for licenses and product versions
- Twig template engine integration
- Full i18n support with German (de_CH) translation

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

README.md

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+# WC Licensed Product
+
+A WooCommerce plugin to sell software products using license keys with domain-based validation.
+
+## Description
+
+WC Licensed Product adds a new product type "Licensed Product" to WooCommerce, enabling you to sell software with automatically generated license keys. Licenses are bound to specific domains and can be validated through a REST API.
+
+## Features
+
+- **Licensed Product Type**: New WooCommerce product type for software sales
+- **Automatic License Generation**: License keys generated on order completion
+- **Domain Binding**: Licenses are bound to customer-specified domains
+- **REST API**: Public endpoints for license validation and management
+- **Customer Account**: Customers can view their licenses in My Account
+- **Admin Management**: Full CRUD interface for license management
+- **Version Binding**: Optional binding to major software versions
+- **Expiration Support**: Set license validity periods or lifetime licenses
+
+## Requirements
+
+- WordPress 6.0 or higher
+- WooCommerce 10.0 or higher
+- PHP 8.3 or higher
+
+## Installation
+
+1. Upload the `wc-licensed-product` folder to `/wp-content/plugins/`
+2. Activate the plugin through the 'Plugins' menu in WordPress
+3. The plugin will create necessary database tables on activation
+
+## Usage
+
+### Creating a Licensed Product
+
+1. Go to Products > Add New
+2. Select "Licensed Product" from the product type dropdown
+3. Configure the product price in the General tab
+4. Set license options in the "License Settings" tab:
+   - **Max Activations**: Number of domains allowed per license
+   - **License Validity**: Days until expiration (empty = lifetime)
+   - **Bind to Major Version**: Lock license to current major version
+   - **Current Version**: Your software's current version
+
+### Customer Checkout
+
+When a customer purchases a licensed product, they must enter the domain where they will use the license during checkout.
+
+### Viewing Licenses
+
+- **Customers**: My Account > Licenses
+- **Administrators**: WooCommerce > Licenses
+
+## REST API
+
+### Validate License
+
+```http
+POST /wp-json/wc-licensed-product/v1/validate
+Content-Type: application/json
+
+{
+  "license_key": "XXXX-XXXX-XXXX-XXXX",
+  "domain": "example.com"
+}
+```
+
+### Check Status
+
+```http
+POST /wp-json/wc-licensed-product/v1/status
+Content-Type: application/json
+
+{
+  "license_key": "XXXX-XXXX-XXXX-XXXX"
+}
+```
+
+### Activate License
+
+```http
+POST /wp-json/wc-licensed-product/v1/activate
+Content-Type: application/json
+
+{
+  "license_key": "XXXX-XXXX-XXXX-XXXX",
+  "domain": "newdomain.com"
+}
+```
+
+### Deactivate License
+
+```http
+POST /wp-json/wc-licensed-product/v1/deactivate
+Content-Type: application/json
+
+{
+  "license_key": "XXXX-XXXX-XXXX-XXXX",
+  "domain": "example.com"
+}
+```
+
+## License Statuses
+
+- **Active**: License is valid and usable
+- **Inactive**: License has been deactivated
+- **Expired**: License validity period has ended
+- **Revoked**: License has been manually revoked by admin
+
+## Support
+
+For issues and feature requests, please visit:
+<https://src.bundespruefstelle.ch/magdev/wc-licensed-product/issues>
+
+## Author
+
+Marco Graetsch
+
+## License
+
+GPL-2.0-or-later