feat(migration): tambah migrasi untuk tabel notifications

Menambahkan migrasi baru untuk tabel `notifications` dengan rincian:
- Membuat tabel `notifications` dengan kolom:
  - `id` (UUID, primary key).
  - `type` (string).
  - `notifiable` (morphs).
  - `data` (text).
  - `read_at` (timestamp, nullable).
  - `timestamps` (created_at dan updated_at).
- Menyediakan fungsi `up` untuk membuat tabel.
- Menyediakan fungsi `down` untuk menghapus tabel.

database/migrations/2025_04_26_110512_create_notifications_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('notifications', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->string('type');
+            $table->morphs('notifiable');
+            $table->text('data');
+            $table->timestamp('read_at')->nullable();
+            $table->timestamps();
+        });
+    }
+
+    /**
+     * Reverse the migrations.
+     */
+    public function down(): void
+    {
+        Schema::dropIfExists('notifications');
+    }
+};