Add invoice PDF generation with dompdf

Install barryvdh/laravel-dompdf, create professional invoice Blade template
with EZSCALE branding, add download endpoints for customer billing and admin
invoice pages.

Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>

website/tests/Feature/InvoicePdfTest.php

@@ -0,0 +1,99 @@
+<?php
+
+declare(strict_types=1);
+
+use App\Models\Invoice;
+use App\Models\InvoiceItem;
+use App\Models\User;
+use Database\Seeders\RoleAndPermissionSeeder;
+
+beforeEach(function (): void {
+    $this->seed(RoleAndPermissionSeeder::class);
+    $this->accountUrl = 'http://'.config('app.domains.account');
+    $this->adminUrl = 'http://'.config('app.domains.admin');
+});
+
+it('allows customer to download their own invoice as PDF', function (): void {
+    $user = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->create(['user_id' => $user->id]);
+    InvoiceItem::factory()->create([
+        'invoice_id' => $invoice->id,
+        'description' => 'VPS Hosting - Basic Plan',
+        'amount' => '29.99',
+        'quantity' => 1,
+    ]);
+
+    $response = $this->actingAs($user)
+        ->get($this->accountUrl.'/billing/invoices/'.$invoice->id.'/download');
+
+    $response->assertOk();
+    $response->assertHeader('content-type', 'application/pdf');
+    expect($response->headers->get('content-disposition'))
+        ->toContain("invoice-{$invoice->number}.pdf");
+});
+
+it('prevents customer from downloading another users invoice', function (): void {
+    $user = User::factory()->customer()->create();
+    $otherUser = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->create(['user_id' => $otherUser->id]);
+
+    $this->actingAs($user)
+        ->get($this->accountUrl.'/billing/invoices/'.$invoice->id.'/download')
+        ->assertForbidden();
+});
+
+it('allows admin to download any invoice as PDF', function (): void {
+    $admin = User::factory()->admin()->create();
+    $customer = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->create(['user_id' => $customer->id]);
+
+    $response = $this->actingAs($admin)
+        ->get($this->adminUrl.'/invoices/'.$invoice->id.'/download');
+
+    $response->assertOk();
+    $response->assertHeader('content-type', 'application/pdf');
+    expect($response->headers->get('content-disposition'))
+        ->toContain("invoice-{$invoice->number}.pdf");
+});
+
+it('returns PDF with correct content-type header', function (): void {
+    $user = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->paid()->create(['user_id' => $user->id]);
+
+    $response = $this->actingAs($user)
+        ->get($this->accountUrl.'/billing/invoices/'.$invoice->id.'/download');
+
+    $response->assertOk();
+    expect($response->headers->get('content-type'))->toBe('application/pdf');
+});
+
+it('includes invoice number in the PDF filename', function (): void {
+    $user = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->create([
+        'user_id' => $user->id,
+        'number' => 'INV-TEST-001',
+    ]);
+
+    $response = $this->actingAs($user)
+        ->get($this->accountUrl.'/billing/invoices/'.$invoice->id.'/download');
+
+    $response->assertOk();
+    expect($response->headers->get('content-disposition'))
+        ->toContain('invoice-INV-TEST-001.pdf');
+});
+
+it('requires authentication to download invoice', function (): void {
+    $invoice = Invoice::factory()->create();
+
+    $this->get($this->accountUrl.'/billing/invoices/'.$invoice->id.'/download')
+        ->assertRedirect();
+});
+
+it('denies customer access to admin invoice download route', function (): void {
+    $customer = User::factory()->customer()->create();
+    $invoice = Invoice::factory()->create(['user_id' => $customer->id]);
+
+    $this->actingAs($customer)
+        ->get($this->adminUrl.'/invoices/'.$invoice->id.'/download')
+        ->assertForbidden();
+});