feat: granular permissions, export backup, user/role management

- PermissionSeeder: 29 permissions with role mapping (admin/manager/staff)
- Policies updated to use hasPermissionTo() instead of hasRole()
- ExportBackup command: JSON per-table backup with chunk processing
- UserResource: CRUD users with role assignment (admin only)
- RoleResource: CRUD roles with permission assignment (admin only)
- UserPolicy + RolePolicy: admin-only access control
- ImportCskh: detailed skip logging with color in dry-run mode
- Widgets: permission-based visibility checks
- Tests: 8/8 pass (21 assertions)

app/Policies/RolePolicy.php

@@ -0,0 +1,44 @@
+<?php
+
+namespace App\Policies;
+
+use App\Models\User;
+use Spatie\Permission\Models\Role;
+
+class RolePolicy
+{
+    public function viewAny(User $user): bool
+    {
+        return $user->hasRole('admin');
+    }
+
+    public function view(User $user, Role $role): bool
+    {
+        return $user->hasRole('admin');
+    }
+
+    public function create(User $user): bool
+    {
+        return $user->hasRole('admin');
+    }
+
+    public function update(User $user, Role $role): bool
+    {
+        return $user->hasRole('admin');
+    }
+
+    public function delete(User $user, Role $role): bool
+    {
+        return $user->hasRole('admin') && ! in_array($role->name, ['admin', 'manager', 'staff']);
+    }
+
+    public function restore(User $user, Role $role): bool
+    {
+        return $user->hasRole('admin');
+    }
+
+    public function forceDelete(User $user, Role $role): bool
+    {
+        return $user->hasRole('admin') && ! in_array($role->name, ['admin', 'manager', 'staff']);
+    }
+}