feat: Implement value change logging functionality with models, traits, and migration; add tests for logging behavior and value change mapping

database/migrations/2026_08_03_000200_create_value_changes_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
+{
+    public function up(): void
+    {
+        Schema::create('value_changes', function (Blueprint $table): void {
+            $table->id();
+            $table->morphs('trackable');
+            $table->string('attribute');
+            $table->text('old_value')->nullable();
+            $table->text('new_value')->nullable();
+            $table->timestamp('changed_at');
+            $table->string('actor_type');
+            $table->foreignId('user_id')
+                ->nullable()
+                ->constrained('users')
+                ->cascadeOnUpdate()
+                ->nullOnDelete();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('value_changes');
+    }
+};