feat: add ActivityLog model and migration with record() helper

database/migrations/2026_06_03_create_activity_logs_table.php

@@ -0,0 +1,27 @@
+<?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('activity_logs', function (Blueprint $table) {
+            $table->id();
+            $table->foreignId('user_id')->nullable()->constrained('users')->nullOnDelete();
+            $table->string('user_name')->nullable();
+            $table->string('action');
+            $table->string('description');
+            $table->string('subject_type')->nullable();
+            $table->string('subject_id')->nullable();
+            $table->string('ip_address', 45)->nullable();
+            $table->timestamps();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('activity_logs');
+    }
+};