test: add Pest browser testing with SQLite :memory: schema

Set up end-to-end browser testing using Pest Browser Plugin + Playwright.
New v4 test suite uses SQLite :memory: database with pre-generated schema dump
(database/schema/testing-schema.sql) instead of running migrations, enabling
faster test startup.

- Add pestphp/pest-plugin-browser dependency
- Create GenerateTestingSchema command to export PostgreSQL schema to SQLite
- Add .env.testing configuration for isolated test environment
- Implement v4 test directory structure (Feature, Browser, Unit tests)
- Update Pest skill documentation with browser testing patterns, API reference,
  debugging techniques, and common pitfalls
- Configure phpunit.xml and tests/Pest.php for v4 suite
- Update package.json and docker-compose.dev.yml for testing dependencies

tests/v4/Browser/LoginTest.php

@@ -0,0 +1,46 @@
+<?php
+
+use App\Models\InstanceSettings;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\Hash;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    InstanceSettings::create(['id' => 0]);
+});
+
+it('shows registration page when no users exist', function () {
+    $page = visit('/login');
+
+    $page->assertSee('Root User Setup')
+        ->assertSee('Create Account');
+});
+
+it('can login with valid credentials', function () {
+    User::factory()->create([
+        'id' => 0,
+        'email' => 'test@example.com',
+        'password' => Hash::make('password'),
+    ]);
+
+    $page = visit('/login');
+
+    $page->assertSee('Login');
+});
+
+it('fails login with invalid credentials', function () {
+    User::factory()->create([
+        'id' => 0,
+        'email' => 'test@example.com',
+        'password' => Hash::make('password'),
+    ]);
+
+    $page = visit('/login');
+
+    $page->fill('email', 'random@email.com')
+        ->fill('password', 'wrongpassword123')
+        ->click('Login')
+        ->assertSee('These credentials do not match our records');
+});

tests/v4/Browser/RegistrationTest.php

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+<?php
+
+use App\Models\InstanceSettings;
+use App\Models\User;
+use Illuminate\Foundation\Testing\RefreshDatabase;
+
+uses(RefreshDatabase::class);
+
+beforeEach(function () {
+    InstanceSettings::create(['id' => 0]);
+});
+
+it('shows registration page when no users exist', function () {
+    $page = visit('/register');
+
+    $page->assertSee('Root User Setup')
+        ->assertSee('Create Account');
+});
+
+it('can register a new root user', function () {
+    $page = visit('/register');
+
+    $page->fill('name', 'Test User')
+        ->fill('email', 'root@example.com')
+        ->fill('password', 'Password1!@')
+        ->fill('password_confirmation', 'Password1!@')
+        ->click('Create Account')
+        ->assertPathIs('/onboarding');
+
+    expect(User::where('email', 'root@example.com')->exists())->toBeTrue();
+});
+
+it('fails registration with mismatched passwords', function () {
+    $page = visit('/register');
+
+    $page->fill('name', 'Test User')
+        ->fill('email', 'root@example.com')
+        ->fill('password', 'Password1!@')
+        ->fill('password_confirmation', 'DifferentPass1!@')
+        ->click('Create Account')
+        ->assertSee('password');
+});
+
+it('fails registration with weak password', function () {
+    $page = visit('/register');
+
+    $page->fill('name', 'Test User')
+        ->fill('email', 'root@example.com')
+        ->fill('password', 'short')
+        ->fill('password_confirmation', 'short')
+        ->click('Create Account')
+        ->assertSee('password');
+});
+
+it('shows login link when a user already exists', function () {
+    User::factory()->create(['id' => 0]);
+
+    $page = visit('/register');
+
+    $page->assertSee('Already registered?')
+        ->assertDontSee('Root User Setup');
+});

tests/v4/Feature/SqliteDatabaseTest.php

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+<?php
+
+use Illuminate\Foundation\Testing\RefreshDatabase;
+use Illuminate\Support\Facades\DB;
+use Illuminate\Support\Facades\Schema;
+
+uses(RefreshDatabase::class);
+
+it('uses sqlite for testing', function () {
+    expect(DB::connection()->getDriverName())->toBe('sqlite');
+});
+
+it('runs migrations successfully', function () {
+    expect(Schema::hasTable('users'))->toBeTrue();
+    expect(Schema::hasTable('teams'))->toBeTrue();
+    expect(Schema::hasTable('servers'))->toBeTrue();
+    expect(Schema::hasTable('applications'))->toBeTrue();
+});