`webhookUrl()` doesn't account for route prefixes

[FredrikAnkarang]

Description

When Webhooks::routes() is registered in a route file with automatic prefixing (e.g., routes/api.php), the generated webhook URLs don't include the prefix, causing 404
errors.

Expected vs Actual

Routes registered at:
api/webhooks/signal/{slug}/{workflowId}/{signal}

URLs generated:
webhooks/signal/{slug}/{workflowId}/{signal}

The api/ prefix is missing from generated URLs.

Root Cause

Laravel automatically prefixes routes in routes/api.php with api/, but Activity::webhookUrl() only uses the webhooks_route config value, unaware of any route prefixes.

Attempted Workaround Fails

Setting config to 'webhooks_route' => 'api/webhooks' causes double prefixing:
api/api/webhooks/signal/...

Proposed Fix

Use Laravel's named routes and route() helper instead of manual URL construction.

Webhooks.php - Add route names:

Route::post(
    "{$basePath}/signal/{$slug}/{workflowId}/{$signal}",
    static function (Request $request, $workflowId) use ($workflow, $method) {
        // ... handler
    }
)->name("workflows.signal.{$slug}.{$signal}");

Activity.php - Use route() helper:

  public function webhookUrl(string $signalMethod = ''): string
  {
      $workflow = Str::kebab(class_basename($this->storedWorkflow->class));

      if ($signalMethod === '') {
          return route("workflows.start.{$workflow}");
      }

      $signal = Str::kebab($signalMethod);
      return route("workflows.signal.{$workflow}.{$signal}", [
          'workflowId' => $this->storedWorkflow->id
      ]);
  }

Benefits:

• Laravel's route() automatically handles all prefixes, domains, HTTPS, etc.
• Standard Laravel convention
• Works with route caching
• No manual URL construction or prefix configuration needed