Add complete Laravel LLM Gateway implementation

Core Features:
- Multi-provider support (OpenAI, Anthropic, DeepSeek, Gemini, Mistral)
- Provider service architecture with abstract base class
- Dynamic model discovery from provider APIs
- Encrypted per-user provider credentials storage

Admin Interface:
- Complete admin panel with Livewire components
- User management with CRUD operations
- API key management with testing capabilities
- Budget system with limits and reset schedules
- Usage logs with filtering and CSV export
- Model pricing management with cost calculator
- Dashboard with Chart.js visualizations

Database Schema:
- MariaDB migrations for all tables
- User provider credentials (encrypted)
- LLM request logging
- Budget tracking and rate limiting
- Model pricing configuration

API Implementation:
- OpenAI-compatible endpoints
- Budget checking middleware
- Rate limit enforcement
- Request logging jobs
- Cost calculation service

Testing:
- Unit tests for all provider services
- Provider factory tests
- Cost calculator tests

Documentation:
- Admin user seeder
- Model pricing seeder
- Configuration files

laravel-app/app/Jobs/LogLlmRequest.php

@@ -0,0 +1,88 @@
+<?php
+
+namespace App\Jobs;
+
+use App\Models\LlmRequest;
+use Illuminate\Bus\Queueable;
+use Illuminate\Contracts\Queue\ShouldQueue;
+use Illuminate\Foundation\Bus\Dispatchable;
+use Illuminate\Queue\InteractsWithQueue;
+use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Facades\Log;
+
+class LogLlmRequest implements ShouldQueue
+{
+    use Dispatchable, InteractsWithQueue, Queueable, SerializesModels;
+
+    public int $timeout = 30;
+    public int $tries = 3;
+    public int $maxExceptions = 3;
+
+    public function __construct(
+        private int $userId,
+        private string $provider,
+        private string $model,
+        private array $requestPayload,
+        private ?array $responsePayload,
+        private int $promptTokens,
+        private int $completionTokens,
+        private int $totalTokens,
+        private ?int $responseTimeMs,
+        private float $promptCost,
+        private float $completionCost,
+        private float $totalCost,
+        private string $status,
+        private ?string $errorMessage = null,
+        private ?int $httpStatus = null,
+        private ?string $ipAddress = null,
+        private ?string $userAgent = null,
+        private ?string $requestId = null
+    ) {}
+
+    public function handle(): void
+    {
+        try {
+            LlmRequest::create([
+                'user_id' => $this->userId,
+                'provider' => $this->provider,
+                'model' => $this->model,
+                'request_payload' => $this->requestPayload,
+                'response_payload' => $this->responsePayload,
+                'prompt_tokens' => $this->promptTokens,
+                '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,
+                'status' => $this->status,
+                'error_message' => $this->errorMessage,
+                'http_status' => $this->httpStatus,
+                'ip_address' => $this->ipAddress,
+                'user_agent' => $this->userAgent,
+                'request_id' => $this->requestId,
+            ]);
+        } catch (\Exception $e) {
+            Log::error('Failed to log LLM request', [
+                'error' => $e->getMessage(),
+                'user_id' => $this->userId,
+                'provider' => $this->provider,
+                'model' => $this->model,
+                'request_id' => $this->requestId,
+            ]);
+            
+            throw $e;
+        }
+    }
+
+    public function failed(\Throwable $exception): void
+    {
+        Log::critical('LogLlmRequest job failed after all retries', [
+            'user_id' => $this->userId,
+            'provider' => $this->provider,
+            'model' => $this->model,
+            'request_id' => $this->requestId,
+            'error' => $exception->getMessage(),
+        ]);
+    }
+}