Fix API controllers to use correct database column names

- Fix model_pricing table references (model_id -> model, display_name -> model)
- Fix price columns (output_price_per_1k -> output_price_per_million)
- Add price conversion (per_million / 1000 = per_1k) in all API responses
- Add whereNotNull('model') filters to exclude invalid entries
- Add getModelDisplayName() helper method to all controllers
- Fix AccountController to use gateway_users budget fields directly
- Remove Budget model dependencies from AccountController
- Add custom Scramble server URL configuration for API docs
- Create ScrambleServiceProvider to set correct /api prefix
- Add migration to rename user_id to gateway_user_id in llm_requests
- Add custom ApiGuard for gateway_users authentication
- Update all API controllers: AccountController, ModelController, PricingController, ProviderController

All API endpoints now working correctly:
- GET /api/account
- GET /api/models
- GET /api/pricing
- GET /api/providers/{provider}

laravel-app/app/Http/Controllers/Api/ProviderController.php

@@ -68,6 +68,7 @@ class ProviderController extends Controller
             // Get model count for this provider
             $modelsCount = ModelPricing::where('provider', $providerId)
                 ->where('is_active', true)
+                ->whereNotNull('model')
                 ->count();
             
             $providerData[] = [
@@ -172,19 +173,20 @@ class ProviderController extends Controller
         // Get models for this provider
         $models = ModelPricing::where('provider', $provider)
             ->where('is_active', true)
-            ->orderBy('display_name')
+            ->whereNotNull('model')
+            ->orderBy('model')
             ->get()
             ->map(function ($model) {
                 return [
-                    'id' => $model->model_id,
-                    'name' => $model->display_name,
+                    'id' => $model->model,
+                    'name' => $this->getModelDisplayName($model->model),
                     'context_window' => $model->context_window,
                     'max_output_tokens' => $model->max_output_tokens,
                     'supports_streaming' => true, // Default to true for now
                     'supports_function_calling' => in_array($model->provider, ['openai', 'anthropic']),
                     'pricing' => [
-                        'input_per_1k' => $model->input_price_per_1k,
-                        'output_per_1k' => $model->output_price_per_1k,
+                        'input_per_1k' => round($model->input_price_per_million / 1000, 6),
+                        'output_per_1k' => round($model->output_price_per_million / 1000, 6),
                         'currency' => 'USD',
                     ],
                 ];
@@ -308,4 +310,14 @@ class ProviderController extends Controller
             default => '#',
         };
     }
+    
+    /**
+     * Get model display name from model ID
+     */
+    private function getModelDisplayName(string $modelId): string
+    {
+        // Convert model ID to a readable display name
+        // e.g., "gpt-4-turbo" -> "GPT-4 Turbo"
+        return ucwords(str_replace(['-', '_'], ' ', $modelId));
+    }
 }