Add git submodule and Gitea CI/CD pipeline for v0.7.2

- Convert wc-licensed-product-client from Composer VCS to git submodule
- Add Gitea Actions workflow for automated releases on version tags
- Update composer.json to use path repository for submodule
- Workflow includes: submodule checkout, PHP setup, translation compilation,
  version verification, package creation, checksum generation, release upload

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

composer.lock

@@ -4,15 +4,15 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "05af8ab515abe7e689c610724b54e27a",
+    "content-hash": "f13b7ed9531068d0180f28adc8a80397",
     "packages": [
         {
             "name": "magdev/wc-licensed-product-client",
             "version": "dev-main",
-            "source": {
-                "type": "git",
-                "url": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client.git",
-                "reference": "56abe8a97c72419c07a6daf263ba6f4a9b5fe4b1"
+            "dist": {
+                "type": "path",
+                "url": "lib/wc-licensed-product-client",
+                "reference": "f9281ec5fb23bf1993ab0240e0347c835009a10f"
             },
             "require": {
                 "php": "^8.3",
@@ -24,7 +24,6 @@
             "require-dev": {
                 "phpunit/phpunit": "^11.0"
             },
-            "default-branch": true,
             "type": "library",
             "autoload": {
                 "psr-4": {
@@ -52,7 +51,9 @@
                 "issues": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client/issues",
                 "source": "https://src.bundespruefstelle.ch/magdev/wc-licensed-product-client"
             },
-            "time": "2026-01-28T10:56:47+00:00"
+            "transport-options": {
+                "relative": true
+            }
         },
         {
             "name": "psr/cache",