feat: AfterSales CRM - SOP compliant real-estate customer care system

- Departments + cross-department transfer workflow
- Role-based closing (staff→resolved, manager→closed) with proof_of_resolution
- Private file storage with collection system + temporary signed URLs
- Dashboard: resolved tickets table, stats, handler performance bar chart
- Spatie RBAC (admin/manager/staff)
- Notifications: TicketTransferred, TicketClosed (database + mail)
- Pest tests: 8 tests, 21 assertions
- Docker production-ready (Dockerfile + compose + entrypoint)

app/Rules/RequireProofOfResolution.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Rules;
+
+use App\Models\Feedback;
+use App\Services\FileService;
+use Closure;
+use Illuminate\Contracts\Validation\ValidationRule;
+use Illuminate\Support\Facades\App;
+
+class RequireProofOfResolution implements ValidationRule
+{
+    protected Feedback $feedback;
+
+    public function __construct(Feedback $feedback)
+    {
+        $this->feedback = $feedback;
+    }
+
+    public function validate(string $attribute, mixed $value, Closure $fail): void
+    {
+        if ($value !== 'closed') {
+            return;
+        }
+
+        $fileService = App::make(FileService::class);
+
+        if (! $fileService->hasCollection($this->feedback, 'proof_of_resolution')) {
+            $fail(__('Yêu cầu cung cấp tài liệu bằng chứng để hoàn tất quy trình.'));
+        }
+    }
+}