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

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

app/Models/PricePrediction.php

@@ -4,7 +4,9 @@ namespace App\Models;
 
 use App\Enums\PredictionSource;
 use App\Enums\TrendDirection;
+use Database\Factories\PricePredictionFactory;
 use Illuminate\Database\Eloquent\Attributes\Fillable;
+use Illuminate\Database\Eloquent\Factories\HasFactory;
 use Illuminate\Database\Eloquent\Model;
 use Illuminate\Support\Carbon;
 
@@ -20,6 +22,9 @@ use Illuminate\Support\Carbon;
 #[Fillable(['predicted_for', 'source', 'direction', 'confidence', 'reasoning', 'generated_at'])]
 class PricePrediction extends Model
 {
+    /** @use HasFactory<PricePredictionFactory> */
+    use HasFactory;
+
     public $timestamps = false;
 
     protected function casts(): array