✨ 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/SearchMcpToolTest.php

@@ -0,0 +1,73 @@
+<?php
+
+use App\Mcp\Servers\EinundzwanzigServer;
+use App\Mcp\Tools\Search\ListCountriesTool;
+use App\Mcp\Tools\Search\SearchCitiesTool;
+use App\Mcp\Tools\Search\SearchCoursesTool;
+use App\Mcp\Tools\Search\SearchLecturersTool;
+use App\Mcp\Tools\Search\SearchVenuesTool;
+use App\Models\City;
+use App\Models\Country;
+use App\Models\Course;
+use App\Models\Lecturer;
+use App\Models\User;
+use App\Models\Venue;
+
+/**
+ * NOTE: The search closures use Postgres `ilike`, which the SQLite test database
+ * does not support. We therefore call the tools without a `search` argument and
+ * rely on the limit(10) branch to return the single seeded record.
+ */
+it('returns cities', function () {
+    City::factory()->create(['name' => 'Ansbach']);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(SearchCitiesTool::class, [])
+        ->assertOk()
+        ->assertSee('Ansbach');
+});
+
+it('returns venues', function () {
+    Venue::factory()->create(['name' => 'Plan B Lugano']);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(SearchVenuesTool::class, [])
+        ->assertOk()
+        ->assertSee('Plan B Lugano');
+});
+
+it('returns lecturers', function () {
+    Lecturer::factory()->create(['name' => 'Saifedean Ammous']);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(SearchLecturersTool::class, [])
+        ->assertOk()
+        ->assertSee('Saifedean Ammous');
+});
+
+it('returns courses', function () {
+    Course::factory()->create(['name' => 'Bitcoin Masterclass']);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(SearchCoursesTool::class, [])
+        ->assertOk()
+        ->assertSee('Bitcoin Masterclass');
+});
+
+it('filters courses by user_id', function () {
+    $user = User::factory()->create();
+    Course::factory()->create(['name' => 'Owned Course', 'created_by' => $user->id]);
+
+    EinundzwanzigServer::actingAs($user)
+        ->tool(SearchCoursesTool::class, ['user_id' => $user->id])
+        ->assertOk()
+        ->assertSee('Owned Course');
+});
+
+it('lists countries', function () {
+    Country::factory()->create(['name' => 'Deutschland', 'code' => 'DE']);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(ListCountriesTool::class, [])
+        ->assertOk();
+});