Add unit tests for models and services

- Implemented unit tests for the Package model, covering methods such as generateId, findById, findByName, and version management.
- Created unit tests for the Repository model, including repository creation, name validation, and retrieval methods.
- Added tests for the Session model, focusing on session creation, validation, and invalidation.
- Developed unit tests for the User model, ensuring user creation, password hashing, and retrieval methods function correctly.
- Implemented AuthService tests, validating login, token refresh, and session management.
- Added TokenService tests, covering token creation, validation, and revocation processes.

test/fixtures/composer/stacktest/demo-package/composer.json

@@ -0,0 +1,21 @@
+{
+    "name": "stacktest/demo-package",
+    "description": "Demo package for Stack.Gallery Registry e2e tests",
+    "version": "1.0.0",
+    "type": "library",
+    "license": "MIT",
+    "authors": [
+        {
+            "name": "Stack.Gallery Test",
+            "email": "test@stack.gallery"
+        }
+    ],
+    "require": {
+        "php": ">=8.0"
+    },
+    "autoload": {
+        "psr-4": {
+            "StackTest\\DemoPackage\\": "src/"
+        }
+    }
+}