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/Http/Controllers/Admin/UserBudgetController.php

@@ -0,0 +1,95 @@
+<?php
+
+namespace App\Http\Controllers\Admin;
+
+use App\Http\Controllers\Controller;
+use App\Models\User;
+use App\Models\UserBudget;
+use App\Services\Budget\BudgetChecker;
+use App\Services\RateLimit\RateLimitChecker;
+use Illuminate\Http\Request;
+
+class UserBudgetController extends Controller
+{
+    public function __construct(
+        private BudgetChecker $budgetChecker,
+        private RateLimitChecker $rateLimitChecker
+    ) {}
+
+    /**
+     * Display budget and rate limit status for a user
+     */
+    public function show(User $user)
+    {
+        $budgetStatus = $this->budgetChecker->getBudgetStatus($user);
+        $rateLimitStatus = $this->rateLimitChecker->getRateLimitStatus($user);
+
+        return view('admin.user-budget.show', compact('user', 'budgetStatus', 'rateLimitStatus'));
+    }
+
+    /**
+     * Update budget limits for a user
+     */
+    public function updateBudget(Request $request, User $user)
+    {
+        $validated = $request->validate([
+            'monthly_limit' => 'required|numeric|min:0',
+            'daily_limit' => 'nullable|numeric|min:0',
+            'alert_threshold_percentage' => 'required|integer|min:0|max:100',
+        ]);
+
+        $budget = $user->budget ?? new UserBudget(['user_id' => $user->id]);
+        $budget->fill($validated);
+        $budget->save();
+
+        return back()->with('success', 'Budget limits updated successfully!');
+    }
+
+    /**
+     * Update rate limits for a user
+     */
+    public function updateRateLimit(Request $request, User $user)
+    {
+        $validated = $request->validate([
+            'requests_per_minute' => 'required|integer|min:0',
+            'requests_per_hour' => 'required|integer|min:0',
+            'requests_per_day' => 'required|integer|min:0',
+        ]);
+
+        $rateLimit = $user->rateLimit ?? new \App\Models\RateLimit(['user_id' => $user->id]);
+        $rateLimit->fill($validated);
+        $rateLimit->save();
+
+        return back()->with('success', 'Rate limits updated successfully!');
+    }
+
+    /**
+     * Reset rate limit for a user
+     */
+    public function resetRateLimit(User $user)
+    {
+        $this->rateLimitChecker->resetRateLimit($user);
+
+        return back()->with('success', 'Rate limit reset successfully!');
+    }
+
+    /**
+     * Reset budget for a user (admin action)
+     */
+    public function resetBudget(User $user)
+    {
+        $budget = $user->budget;
+        
+        if ($budget) {
+            $budget->current_month_spending = 0.0;
+            $budget->current_day_spending = 0.0;
+            $budget->is_budget_exceeded = false;
+            $budget->last_alert_sent_at = null;
+            $budget->month_started_at = now()->startOfMonth();
+            $budget->day_started_at = now()->startOfDay();
+            $budget->save();
+        }
+
+        return back()->with('success', 'Budget reset successfully!');
+    }
+}