feat: complete approval workflow

database/migrations/2026_08_04_000500_create_notifications_table.php

@@ -0,0 +1,25 @@
+<?php
+
+use Illuminate\Database\Migrations\Migration;
+use Illuminate\Database\Schema\Blueprint;
+use Illuminate\Support\Facades\Schema;
+
+return new class extends Migration
+{
+    public function up(): void
+    {
+        Schema::create('notifications', function (Blueprint $table) {
+            $table->uuid('id')->primary();
+            $table->string('type');
+            $table->morphs('notifiable');
+            $table->text('data');
+            $table->timestampTz('read_at')->nullable();
+            $table->timestampsTz();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('notifications');
+    }
+};