feat: add HasFactory and factories for ApiLog, BrentPrice, PricePrediction

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

app/Models/ApiLog.php

@@ -2,12 +2,17 @@
 
 namespace App\Models;
 
+use Database\Factories\ApiLogFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 
 #[Fillable(['service', 'method', 'url', 'status_code', 'duration_ms', 'error'])]
 class ApiLog extends Model
 {
+    /** @use HasFactory<ApiLogFactory> */
+    use HasFactory;
+
     const null UPDATED_AT = null;
 
     protected function casts(): array