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/Services/LLM/RequestLogger.php

@@ -0,0 +1,96 @@
+<?php
+
+namespace App\Services\LLM;
+
+use App\Jobs\LogLlmRequest;
+use Illuminate\Support\Str;
+
+class RequestLogger
+{
+    /**
+     * Log a successful LLM request
+     */
+    public function logSuccess(
+        int $userId,
+        string $provider,
+        string $model,
+        array $requestPayload,
+        array $responsePayload,
+        array $costs,
+        int $responseTimeMs,
+        ?string $ipAddress = null,
+        ?string $userAgent = null
+    ): string {
+        $requestId = $this->generateRequestId();
+
+        LogLlmRequest::dispatch(
+            userId: $userId,
+            provider: $provider,
+            model: $model,
+            requestPayload: $requestPayload,
+            responsePayload: $responsePayload,
+            promptTokens: $responsePayload['usage']['prompt_tokens'] ?? 0,
+            completionTokens: $responsePayload['usage']['completion_tokens'] ?? 0,
+            totalTokens: $responsePayload['usage']['total_tokens'] ?? 0,
+            responseTimeMs: $responseTimeMs,
+            promptCost: $costs['prompt_cost'],
+            completionCost: $costs['completion_cost'],
+            totalCost: $costs['total_cost'],
+            status: 'success',
+            errorMessage: null,
+            httpStatus: 200,
+            ipAddress: $ipAddress,
+            userAgent: $userAgent,
+            requestId: $requestId
+        );
+
+        return $requestId;
+    }
+
+    /**
+     * Log a failed LLM request
+     */
+    public function logFailure(
+        int $userId,
+        string $provider,
+        string $model,
+        array $requestPayload,
+        string $errorMessage,
+        int $httpStatus,
+        ?string $ipAddress = null,
+        ?string $userAgent = null
+    ): string {
+        $requestId = $this->generateRequestId();
+
+        LogLlmRequest::dispatch(
+            userId: $userId,
+            provider: $provider,
+            model: $model,
+            requestPayload: $requestPayload,
+            responsePayload: null,
+            promptTokens: 0,
+            completionTokens: 0,
+            totalTokens: 0,
+            responseTimeMs: null,
+            promptCost: 0.0,
+            completionCost: 0.0,
+            totalCost: 0.0,
+            status: 'failed',
+            errorMessage: $errorMessage,
+            httpStatus: $httpStatus,
+            ipAddress: $ipAddress,
+            userAgent: $userAgent,
+            requestId: $requestId
+        );
+
+        return $requestId;
+    }
+
+    /**
+     * Generate unique request ID
+     */
+    private function generateRequestId(): string
+    {
+        return 'req_' . Str::random(24);
+    }
+}