✨ 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).

app/Mcp/Tools/Meetup/ListMyMeetupsTool.php

@@ -0,0 +1,33 @@
+<?php
+
+namespace App\Mcp\Tools\Meetup;
+
+use App\Http\Resources\MeetupResource;
+use App\Models\Meetup;
+use Illuminate\Support\Facades\Gate;
+use Laravel\Mcp\Request;
+use Laravel\Mcp\Response;
+use Laravel\Mcp\Server\Attributes\Description;
+use Laravel\Mcp\Server\Tool;
+use Laravel\Mcp\Server\Tools\Annotations\IsReadOnly;
+
+#[IsReadOnly]
+#[Description('Listet alle vom authentifizierten Nutzer erstellten Meetups, alphabetisch sortiert.')]
+class ListMyMeetupsTool extends Tool
+{
+    public function handle(Request $request): Response
+    {
+        $user = $request->user();
+
+        if ($user === null || Gate::forUser($user)->denies('viewAny', Meetup::class)) {
+            return Response::error('Nicht authentifiziert.');
+        }
+
+        $meetups = Meetup::query()
+            ->where('created_by', $user->getAuthIdentifier())
+            ->orderBy('name')
+            ->get();
+
+        return Response::json(MeetupResource::collection($meetups)->resolve());
+    }
+}