Release version 1.3.0 - License management and settings sub-tabs

Breaking Changes:
- PHP 8.3+ now required (previously 7.4+)

Added:
- License management integration using magdev/wc-licensed-product-client
- Settings page split into General and License sub-tabs
- License validation and activation via AJAX
- PHP version check with admin notice

Changed:
- Refactored settings class to use modern WooCommerce patterns
- Updated all translations with new license-related strings

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

languages/wc-tier-package-prices-en_US.po

@@ -277,3 +277,103 @@ msgstr "Price"
 #: includes/class-wc-tpp-product-meta.php:165
 msgid "Label (optional)"
 msgstr "Label (optional)"
+
+#: wc-tier-and-package-prices.php
+msgid "WooCommerce Tier and Package Prices requires PHP 8.3 or higher. Your server is running PHP %s."
+msgstr "WooCommerce Tier and Package Prices requires PHP 8.3 or higher. Your server is running PHP %s."
+
+#: includes/class-wc-tpp-settings.php
+msgid "License"
+msgstr "License"
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Management"
+msgstr "License Management"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Enter your license key to receive updates and support."
+msgstr "Enter your license key to receive updates and support."
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Server URL"
+msgstr "License Server URL"
+
+#: includes/class-wc-tpp-settings.php
+msgid "The URL of the license server."
+msgstr "The URL of the license server."
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Key"
+msgstr "License Key"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Your license key for this plugin."
+msgstr "Your license key for this plugin."
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Status"
+msgstr "License Status"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Validate License"
+msgstr "Validate License"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Activate License"
+msgstr "Activate License"
+
+#: includes/class-wc-tpp-settings.php
+msgid "No license activated"
+msgstr "No license activated"
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Active"
+msgstr "License Active"
+
+#: includes/class-wc-tpp-settings.php
+msgid "License Invalid"
+msgstr "License Invalid"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Lifetime License"
+msgstr "Lifetime License"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Expires: %s"
+msgstr "Expires: %s"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Last checked: %s"
+msgstr "Last checked: %s"
+
+#: includes/class-wc-tpp-settings.php
+msgid "License is valid!"
+msgstr "License is valid!"
+
+#: includes/class-wc-tpp-settings.php
+msgid "License activated successfully!"
+msgstr "License activated successfully!"
+
+#: includes/class-wc-tpp-settings.php
+msgid "Permission denied."
+msgstr "Permission denied."
+
+#: includes/class-wc-tpp-settings.php
+msgid "License key and server URL are required."
+msgstr "License key and server URL are required."
+
+#: includes/class-wc-tpp-settings.php
+msgid "Please enter both license server URL and license key."
+msgstr "Please enter both license server URL and license key."
+
+#: includes/class-wc-tpp-settings.php
+msgid "Validation failed."
+msgstr "Validation failed."
+
+#: includes/class-wc-tpp-settings.php
+msgid "Activation failed."
+msgstr "Activation failed."
+
+#: includes/class-wc-tpp-settings.php
+msgid "Request failed. Please try again."
+msgstr "Request failed. Please try again."