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/Jobs/LogLlmRequest.php

@@ -2,7 +2,7 @@
 
 namespace App\Jobs;
 
-use App\Models\LlmRequest;
+use App\Models\UsageLog;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Queue\ShouldQueue;
 use Illuminate\Foundation\Bus\Dispatchable;
@@ -19,7 +19,7 @@ class LogLlmRequest implements ShouldQueue
     public int $maxExceptions = 3;
 
     public function __construct(
-        private int $userId,
+        private string $userId,  // Changed from int to string for gateway_user_id
         private string $provider,
         private string $model,
         private array $requestPayload,
@@ -42,8 +42,9 @@ class LogLlmRequest implements ShouldQueue
     public function handle(): void
     {
         try {
-            LlmRequest::create([
-                'user_id' => $this->userId,
+            UsageLog::create([
+                'request_id' => $this->requestId,
+                'gateway_user_id' => $this->userId,  // Changed from user_id
                 'provider' => $this->provider,
                 'model' => $this->model,
                 'request_payload' => $this->requestPayload,
@@ -52,20 +53,17 @@ class LogLlmRequest implements ShouldQueue
                 'completion_tokens' => $this->completionTokens,
                 'total_tokens' => $this->totalTokens,
                 'response_time_ms' => $this->responseTimeMs,
-                'prompt_cost' => $this->promptCost,
-                'completion_cost' => $this->completionCost,
-                'total_cost' => $this->totalCost,
+                'cost' => $this->totalCost,  // UsageLog has single 'cost' field
                 'status' => $this->status,
                 'error_message' => $this->errorMessage,
-                'http_status' => $this->httpStatus,
                 'ip_address' => $this->ipAddress,
                 'user_agent' => $this->userAgent,
-                'request_id' => $this->requestId,
+                'timestamp' => now(),  // UsageLog uses 'timestamp' instead of created_at
             ]);
         } catch (\Exception $e) {
-            Log::error('Failed to log LLM request', [
+            Log::error('Failed to log LLM request to UsageLog', [
                 'error' => $e->getMessage(),
-                'user_id' => $this->userId,
+                'gateway_user_id' => $this->userId,
                 'provider' => $this->provider,
                 'model' => $this->model,
                 'request_id' => $this->requestId,
@@ -78,7 +76,7 @@ class LogLlmRequest implements ShouldQueue
     public function failed(\Throwable $exception): void
     {
         Log::critical('LogLlmRequest job failed after all retries', [
-            'user_id' => $this->userId,
+            'gateway_user_id' => $this->userId,
             'provider' => $this->provider,
             'model' => $this->model,
             'request_id' => $this->requestId,