feat: add sub category for media

database/migrations/2026_05_30_100000_create_sub_categories_table.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::create('sub_categories', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('category_id')->constrained('categories')->cascadeOnDelete();
+            $table->string('name');
+            $table->timestamps();
+
+            $table->unique(['category_id', 'name']);
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('sub_categories');
+    }
+};

database/migrations/2026_05_30_100100_add_subcategory_id_to_media_table.php

@@ -0,0 +1,31 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    /**
+     * Run the migrations.
+     */
+    public function up(): void
+    {
+        Schema::table('media', function (Blueprint $table) {
+            $table->unsignedBigInteger('subcategory_id')->nullable()->after('category_id');
+
+            $table->foreign('subcategory_id')->references('id')->on('sub_categories')->nullOnDelete();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::table('media', function (Blueprint $table) {
+            $table->dropForeign(['subcategory_id']);
+            $table->dropColumn('subcategory_id');
+        });
+    }
+};