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

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

app/Models/BrentPrice.php

@@ -2,7 +2,9 @@
 
 namespace App\Models;
 
+use Database\Factories\BrentPriceFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Carbon;
 
@@ -13,6 +15,9 @@ use Illuminate\Support\Carbon;
 #[Fillable(['date', 'price_usd'])]
 class BrentPrice extends Model
 {
+    /** @use HasFactory<BrentPriceFactory> */
+    use HasFactory;
+
     public $timestamps = false;
 
     protected $primaryKey = 'date';