✨ Add OAuth functionality, MCP tools, and feature tests

- 🔒 Added migrations for `oauth_access_tokens`, `oauth_refresh_tokens`, `oauth_auth_codes`, `oauth_clients`, and `oauth_device_codes`.
- 🤖 Created MCP tools (Meetups, Cities, Venues, Courses, Lecturers) for managing entities with authentication and validation.
- 🛠️ Implemented Passport-backed OAuth API guard configuration and validation endpoints.
- ✅ Added comprehensive feature tests for MCP tools and OAuth functionality (access control, validation, and token-based authentication).

tests/Feature/Mcp/EinundzwanzigServerTest.php

@@ -0,0 +1,24 @@
+<?php
+
+use App\Mcp\Servers\EinundzwanzigServer;
+use App\Mcp\Tools\CourseEvent\UpdateCourseEventTool;
+use App\Mcp\Tools\Meetup\CreateMeetupTool;
+use App\Mcp\Tools\Search\SearchCitiesTool;
+
+it('rejects unauthenticated requests to the mcp endpoint', function () {
+    $this->postJson('/mcp', [
+        'jsonrpc' => '2.0',
+        'id' => 1,
+        'method' => 'tools/list',
+    ])->assertUnauthorized();
+});
+
+it('registers every domain tool on the server', function () {
+    $property = (new ReflectionClass(EinundzwanzigServer::class))->getProperty('tools');
+    $tools = $property->getDefaultValue();
+
+    expect($tools)->toHaveCount(30)
+        ->and($tools)->toContain(CreateMeetupTool::class)
+        ->and($tools)->toContain(UpdateCourseEventTool::class)
+        ->and($tools)->toContain(SearchCitiesTool::class);
+});