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/Models/Department.php

@@ -0,0 +1,32 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+use Illuminate\Database\Eloquent\Relations\HasMany;
+
+#[Fillable(['name', 'manager_id'])]
+class Department extends Model
+{
+    public function manager(): BelongsTo
+    {
+        return $this->belongsTo(User::class, 'manager_id');
+    }
+
+    public function feedbacks(): HasMany
+    {
+        return $this->hasMany(Feedback::class, 'current_department_id');
+    }
+
+    public function transferLogsFrom(): HasMany
+    {
+        return $this->hasMany(TicketTransferLog::class, 'from_department_id');
+    }
+
+    public function transferLogsTo(): HasMany
+    {
+        return $this->hasMany(TicketTransferLog::class, 'to_department_id');
+    }
+}