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>

composer.json

@@ -1,7 +1,7 @@
 {
     "name": "magdev/wc-tier-package-prices",
     "description": "WooCommerce plugin for tier pricing and package prices with Twig templates",
-    "version": "1.2.9",
+    "version": "1.3.0",
     "type": "wordpress-plugin",
     "license": "GPL-2.0-or-later",
     "authors": [
@@ -10,9 +10,16 @@
             "homepage": "https://src.bundespruefstelle.ch/magdev"
         }
     ],
+    "repositories": [
+        {
+            "type": "vcs",
+            "url": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client.git"
+        }
+    ],
     "require": {
-        "php": ">=7.4",
-        "twig/twig": "^3.0"
+        "php": ">=8.3",
+        "twig/twig": "^3.0",
+        "magdev/wc-licensed-product-client": "^0.1"
     },
     "autoload": {
         "classmap": [