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/ApiKeyController.php

@@ -51,7 +51,7 @@ class ApiKeyController extends Controller
         $apiKeys = $query->paginate(20)->withQueryString();
         $gatewayUsers = GatewayUser::orderBy('alias')->get();
 
-        return view('api-keys.index', compact('apiKeys', 'gatewayUsers'));
+        return view('keys.index', compact('apiKeys', 'gatewayUsers'));
     }
 
     /**
@@ -60,7 +60,7 @@ class ApiKeyController extends Controller
     public function create()
     {
         $gatewayUsers = GatewayUser::orderBy('alias')->get();
-        return view('api-keys.create', compact('gatewayUsers'));
+        return view('keys.create', compact('gatewayUsers'));
     }
 
     /**
@@ -104,7 +104,7 @@ class ApiKeyController extends Controller
             session()->flash('new_api_key', $token);
             session()->flash('new_api_key_id', $apiKey->token);
 
-            return redirect()->route('api-keys.index')
+            return redirect()->route('keys.index')
                 ->with('success', 'API Key created successfully! Make sure to copy it now - it won\'t be shown again.');
 
         } catch (\Exception $e) {
@@ -136,7 +136,7 @@ class ApiKeyController extends Controller
             ->limit(20)
             ->get();
 
-        return view('api-keys.show', compact('apiKey', 'stats', 'recentLogs'));
+        return view('keys.show', compact('apiKey', 'stats', 'recentLogs'));
     }
 
     /**
@@ -150,7 +150,7 @@ class ApiKeyController extends Controller
             // Delete the API key from database
             $apiKey->delete();
 
-            return redirect()->route('api-keys.index')
+            return redirect()->route('keys.index')
                 ->with('success', 'API Key revoked successfully');
 
         } catch (\Exception $e) {