feat: add Go, PHP, and Laravel SDKs

- Go SDK: zero deps, functional options pattern, full endpoint coverage
- PHP SDK: PHP 8.1+, curl-based, PdfOptions class, PSR-4 autoloading
- Laravel package: ServiceProvider, Facade, config publishing
- All SDKs document complete PDF options including new v0.4.5 params

sdk/laravel/README.md

@@ -0,0 +1,114 @@
+# DocFast for Laravel
+
+Official Laravel integration for the [DocFast](https://docfast.dev) HTML/Markdown to PDF API.
+
+## Installation
+
+```bash
+composer require docfast/laravel
+```
+
+Add your API key to `.env`:
+
+```env
+DOCFAST_API_KEY=df_pro_your_api_key
+```
+
+Publish the config (optional):
+
+```bash
+php artisan vendor:publish --tag=docfast-config
+```
+
+## Usage
+
+### Via Facade
+
+```php
+use DocFast\Laravel\Facades\DocFast;
+
+// HTML to PDF
+$pdf = DocFast::html('<h1>Invoice</h1><p>Total: €99.00</p>');
+return response($pdf)
+    ->header('Content-Type', 'application/pdf')
+    ->header('Content-Disposition', 'inline; filename="invoice.pdf"');
+```
+
+### Via Dependency Injection
+
+```php
+use DocFast\Client;
+
+class InvoiceController extends Controller
+{
+    public function download(Client $docfast)
+    {
+        $pdf = $docfast->html(view('invoice')->render());
+        return response($pdf)
+            ->header('Content-Type', 'application/pdf');
+    }
+}
+```
+
+### Markdown to PDF
+
+```php
+$pdf = DocFast::markdown('# Report\n\nGenerated at ' . now());
+```
+
+### URL to PDF
+
+```php
+$pdf = DocFast::url('https://example.com');
+```
+
+### With PDF Options
+
+```php
+use DocFast\PdfOptions;
+
+$options = new PdfOptions();
+$options->format = 'Letter';
+$options->landscape = true;
+$options->margin = ['top' => '20mm', 'bottom' => '20mm'];
+
+$pdf = DocFast::html($html, null, $options);
+```
+
+### Headers and Footers
+
+```php
+$options = new PdfOptions();
+$options->displayHeaderFooter = true;
+$options->footerTemplate = '<div style="font-size:9px;text-align:center;width:100%">Page <span class="pageNumber"></span></div>';
+$options->margin = ['top' => '10mm', 'bottom' => '20mm'];
+
+$pdf = DocFast::html(view('report')->render(), null, $options);
+```
+
+### Templates
+
+```php
+$pdf = DocFast::renderTemplate('invoice', [
+    'company' => 'Acme Corp',
+    'items' => [['name' => 'Widget', 'price' => 9.99]],
+]);
+```
+
+## Configuration
+
+```php
+// config/docfast.php
+return [
+    'api_key' => env('DOCFAST_API_KEY'),
+    'base_url' => env('DOCFAST_BASE_URL', 'https://docfast.dev'),
+    'timeout' => env('DOCFAST_TIMEOUT', 60),
+];
+```
+
+## Links
+
+- [PHP SDK](../php/) — standalone PHP client
+- [Documentation](https://docfast.dev/docs)
+- [API Reference](https://docfast.dev/openapi.json)
+- [Get an API Key](https://docfast.dev)