feat: implement FeaturedVariant and CatalogController for managing featured variants and catalog display

app/Domains/Product/Models/FeaturedVariant.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace App\Domains\Product\Models;
+
+use App\Domains\Catalog\Models\ProductVariant;
+use Illuminate\Database\Eloquent\Model;
+use Illuminate\Database\Eloquent\Relations\BelongsTo;
+
+class FeaturedVariant extends Model
+{
+    protected $table = 'featured_variants';
+
+    protected $fillable = [
+        'featured_group_id',
+        'product_variant_id',
+        'order',
+    ];
+
+    public function featuredGroup(): BelongsTo
+    {
+        return $this->belongsTo(FeaturedGroup::class);
+    }
+
+    public function variant(): BelongsTo
+    {
+        return $this->belongsTo(ProductVariant::class, 'product_variant_id');
+    }
+}