✨ 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/VenueMcpToolTest.php

@@ -0,0 +1,72 @@
+<?php
+
+use App\Mcp\Servers\EinundzwanzigServer;
+use App\Mcp\Tools\Venue\CreateVenueTool;
+use App\Mcp\Tools\Venue\ListMyVenuesTool;
+use App\Mcp\Tools\Venue\ShowMyVenueTool;
+use App\Mcp\Tools\Venue\UpdateVenueTool;
+use App\Models\City;
+use App\Models\User;
+use App\Models\Venue;
+
+it('lets an authenticated user create a venue and stamps created_by', function () {
+    $user = User::factory()->create();
+    $city = City::factory()->create();
+
+    $response = EinundzwanzigServer::actingAs($user)->tool(CreateVenueTool::class, [
+        'name' => 'Bitcoin Hub',
+        'city_id' => $city->id,
+        'street' => 'Satoshi Street 21',
+    ]);
+
+    $response->assertOk()->assertSee('Bitcoin Hub');
+
+    $this->assertDatabaseHas('venues', [
+        'name' => 'Bitcoin Hub',
+        'created_by' => $user->id,
+    ]);
+});
+
+it('fails validation for missing fields', function () {
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(CreateVenueTool::class, [])
+        ->assertHasErrors();
+});
+
+it('lets the owner update a venue', function () {
+    $user = User::factory()->create();
+    $venue = Venue::factory()->create(['created_by' => $user->id]);
+
+    EinundzwanzigServer::actingAs($user)
+        ->tool(UpdateVenueTool::class, ['id' => $venue->id, 'name' => 'Orange Hub'])
+        ->assertOk()
+        ->assertSee('Orange Hub');
+});
+
+it('forbids updating someone elses venue', function () {
+    $owner = User::factory()->create();
+    $venue = Venue::factory()->create(['created_by' => $owner->id]);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(UpdateVenueTool::class, ['id' => $venue->id, 'name' => 'Hijack'])
+        ->assertHasErrors();
+});
+
+it('returns only own venues in the mine list', function () {
+    $user = User::factory()->create();
+    Venue::factory()->count(2)->create(['created_by' => $user->id]);
+    Venue::factory()->create(['created_by' => User::factory()->create()->id]);
+
+    EinundzwanzigServer::actingAs($user)
+        ->tool(ListMyVenuesTool::class)
+        ->assertOk();
+});
+
+it('forbids viewing someone elses venue in mine show', function () {
+    $owner = User::factory()->create();
+    $venue = Venue::factory()->create(['created_by' => $owner->id]);
+
+    EinundzwanzigServer::actingAs(User::factory()->create())
+        ->tool(ShowMyVenueTool::class, ['id' => $venue->id])
+        ->assertHasErrors();
+});