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/FeedbackChannelPolicy.php

@@ -9,36 +9,36 @@ class FeedbackChannelPolicy
 {
     public function viewAny(User $user): bool
     {
-        return in_array($user->role, ['admin', 'manager', 'staff']);
+        return $user->hasPermissionTo('view-channel');
     }
 
-    public function view(User $user, FeedbackChannel $feedbackChannel): bool
+    public function view(User $user, FeedbackChannel $channel): bool
     {
-        return in_array($user->role, ['admin', 'manager', 'staff']);
+        return $user->hasPermissionTo('view-channel');
     }
 
     public function create(User $user): bool
     {
-        return in_array($user->role, ['admin', 'manager']);
+        return $user->hasPermissionTo('create-channel');
     }
 
-    public function update(User $user, FeedbackChannel $feedbackChannel): bool
+    public function update(User $user, FeedbackChannel $channel): bool
     {
-        return in_array($user->role, ['admin', 'manager']);
+        return $user->hasPermissionTo('update-channel');
     }
 
-    public function delete(User $user, FeedbackChannel $feedbackChannel): bool
+    public function delete(User $user, FeedbackChannel $channel): bool
     {
-        return $user->role === 'admin';
+        return $user->hasPermissionTo('delete-channel');
     }
 
-    public function restore(User $user, FeedbackChannel $feedbackChannel): bool
+    public function restore(User $user, FeedbackChannel $channel): bool
     {
-        return $user->role === 'admin';
+        return $user->hasRole('admin');
     }
 
-    public function forceDelete(User $user, FeedbackChannel $feedbackChannel): bool
+    public function forceDelete(User $user, FeedbackChannel $channel): bool
     {
-        return $user->role === 'admin';
+        return $user->hasRole('admin');
     }
 }