🔥 Remove Laravel Sail, Docker, and related setup, migrate to simplified local development environment

- **Removed:** `docker-compose.yml`, Sail-specific Dockerfiles, and related scripts for PHP 8.3 setup.
- **Updated:** Documentation to reflect a shift from Docker to a direct PHP-based local development workflow.
- **Removed:** `laravel/sail` dependency from `composer.lock`.
- **Implemented:** `#[Locked]` Livewire attribute across components for read-only properties.
- **Added:** Feature tests to ensure locked properties cannot be tampered with.

tests/Feature/LivewireLockedPropertiesTest.php

@@ -0,0 +1,132 @@
+<?php
+
+use App\Models\City;
+use App\Models\Country;
+use App\Models\Meetup;
+use App\Models\SelfHostedService;
+use App\Models\User;
+use Livewire\Features\SupportLockedProperties\CannotUpdateLockedPropertyException;
+use Livewire\Livewire;
+
+beforeEach(function () {
+    $this->user = User::factory()->create(['timezone' => 'Europe/Berlin']);
+    $this->country = Country::factory()->create();
+    $this->city = City::factory()->for($this->country)->create();
+});
+
+describe('Meetup Edit Component', function () {
+    beforeEach(function () {
+        $this->meetup = Meetup::factory()->for($this->city)->create([
+            'created_by' => $this->user->id,
+        ]);
+    });
+
+    it('loads meetup edit page correctly with locked properties', function () {
+        Livewire::actingAs($this->user)
+            ->test('meetups.edit', ['meetup' => $this->meetup])
+            ->assertSet('created_by', $this->meetup->created_by)
+            ->assertSet('created_at', $this->meetup->created_at->format('Y-m-d H:i:s'))
+            ->assertSet('updated_at', $this->meetup->updated_at->format('Y-m-d H:i:s'));
+    });
+
+    it('throws exception when tampering with locked created_by property', function () {
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('meetups.edit', ['meetup' => $this->meetup])
+            ->set('created_by', 999);
+    });
+
+    it('throws exception when tampering with locked created_at property', function () {
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('meetups.edit', ['meetup' => $this->meetup])
+            ->set('created_at', '2020-01-01 00:00:00');
+    });
+
+    it('throws exception when tampering with locked updated_at property', function () {
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('meetups.edit', ['meetup' => $this->meetup])
+            ->set('updated_at', '2020-01-01 00:00:00');
+    });
+
+    it('can still update non-locked properties', function () {
+        Livewire::actingAs($this->user)
+            ->test('meetups.edit', ['meetup' => $this->meetup])
+            ->set('name', 'Updated Meetup Name')
+            ->set('community', 'einundzwanzig')
+            ->call('updateMeetup')
+            ->assertHasNoErrors();
+
+        $this->meetup->refresh();
+        expect($this->meetup->name)->toBe('Updated Meetup Name');
+    });
+});
+
+describe('Meetup Create-Edit Events Component', function () {
+    beforeEach(function () {
+        $this->meetup = Meetup::factory()->for($this->city)->create();
+    });
+
+    it('has locked country property', function () {
+        Livewire::actingAs($this->user)
+            ->test('meetups.create-edit-events', ['meetup' => $this->meetup])
+            ->assertSet('country', 'de');
+    });
+
+    it('throws exception when tampering with locked country property', function () {
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('meetups.create-edit-events', ['meetup' => $this->meetup])
+            ->set('country', 'us');
+    });
+});
+
+describe('Services Create Component', function () {
+    it('has locked country property', function () {
+        Livewire::actingAs($this->user)
+            ->test('services.create')
+            ->assertSet('country', 'de');
+    });
+
+    it('throws exception when tampering with locked country property', function () {
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('services.create')
+            ->set('country', 'us');
+    });
+});
+
+describe('ServiceForm Locked Properties', function () {
+    beforeEach(function () {
+        // Create service with the current user as creator
+        $this->service = SelfHostedService::factory()->create([
+            'created_by' => $this->user->id,
+            'anon' => false,
+        ]);
+    });
+
+    it('has locked service property in edit component', function () {
+        Livewire::actingAs($this->user)
+            ->test('services.edit', ['service' => $this->service])
+            ->assertSet('form.service.id', $this->service->id);
+    });
+
+    it('throws exception when tampering with locked service model in form', function () {
+        $anotherService = SelfHostedService::factory()->create([
+            'created_by' => $this->user->id,
+            'anon' => false,
+        ]);
+
+        $this->expectException(CannotUpdateLockedPropertyException::class);
+
+        Livewire::actingAs($this->user)
+            ->test('services.edit', ['service' => $this->service])
+            ->set('form.service', $anotherService);
+    });
+});