feat: certificate template management and generation (Fasa 7)

- CertificateService: Intervention Image v3 text overlay on template
- GenerateCertificateJob: queued generation with retry logic
- SendCertificateEmailJob: stub (implemented in Fasa 8)
- CertificateTemplateController: upload, config editor, preview, test generate
- Admin/CertificateController: list, generate-all, email-all
- Public/CertificateController: show with questionnaire gate, download
- DejaVuSans fonts bundled under resources/fonts
- Views: admin template/certificate management, public certificate download

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Jobs/GenerateCertificateJob.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\Certificate;
+use App\Services\CertificateService;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+
+class GenerateCertificateJob implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    public int $tries = 3;
+    public int $backoff = 30;
+
+    public function __construct(public readonly Certificate $certificate) {}
+
+    public function handle(CertificateService $service): void
+    {
+        $this->certificate->refresh();
+
+        if ($this->certificate->status === 'generated') {
+            return;
+        }
+
+        $service->generate($this->certificate);
+    }
+}

app/Jobs/SendCertificateEmailJob.php

@@ -0,0 +1,34 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\Certificate;
+use App\Models\Program;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+
+class SendCertificateEmailJob implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    public int $tries = 3;
+    public int $backoff = 60;
+
+    public function __construct(public readonly Certificate $certificate) {}
+
+    public function handle(): void
+    {
+        // Implemented in Fasa 8 — email blast
+    }
+
+    public static function dispatchBatch(Program $program): void
+    {
+        $program->certificates()
+            ->whereIn('status', ['generated'])
+            ->whereNull('emailed_at')
+            ->each(fn($cert) => static::dispatch($cert));
+    }
+}