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/Services/TransferService.php

@@ -0,0 +1,57 @@
+<?php
+
+namespace App\Services;
+
+use App\Models\Department;
+use App\Models\Feedback;
+use App\Models\TicketTransferLog;
+use App\Models\User;
+use Illuminate\Validation\ValidationException;
+
+class TransferService
+{
+    /**
+     * Transfer a feedback to another department.
+     */
+    public function transfer(
+        Feedback $feedback,
+        Department $toDepartment,
+        string $reason,
+        User $sender,
+        ?int $newHandlerId = null,
+    ): TicketTransferLog {
+        if (empty(trim($reason))) {
+            throw ValidationException::withMessages([
+                'reason' => __('Vui lòng nhập lý do chuyển tiếp.'),
+            ]);
+        }
+
+        $fromDepartmentId = $feedback->current_department_id;
+
+        $log = TicketTransferLog::create([
+            'feedback_id' => $feedback->id,
+            'from_department_id' => $fromDepartmentId,
+            'to_department_id' => $toDepartment->id,
+            'sender_id' => $sender->id,
+            'reason' => $reason,
+        ]);
+
+        $feedback->update([
+            'current_department_id' => $toDepartment->id,
+            'assigned_to' => $newHandlerId ?? $toDepartment->manager_id ?? null,
+        ]);
+
+        $this->notifyDepartmentManager($toDepartment, $feedback, $log, $sender);
+
+        return $log;
+    }
+
+    protected function notifyDepartmentManager(Department $department, Feedback $feedback, TicketTransferLog $log, User $sender): void
+    {
+        $manager = $department->manager;
+
+        if ($manager) {
+            $manager->notify(new \App\Notifications\TicketTransferred($feedback, $log, $sender));
+        }
+    }
+}