feat: implement system-wide activity logging with database persistence, repository patterns, and admin controller access.

database/migrations/2026_05_16_000001_create_activity_logs_table.php

@@ -0,0 +1,33 @@
+<?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->string('log_name', 100)->index();
+            $table->string('event', 30)->index();
+            $table->text('description');
+            $table->string('subject_type', 150)->nullable()->index();
+            $table->string('subject_id', 100)->nullable()->index();
+            $table->string('causer_type', 20)->nullable()->index(); // admin | customer | system
+            $table->unsignedBigInteger('causer_id')->nullable()->index();
+            $table->string('causer_name', 150)->nullable();
+            $table->json('old_values')->nullable();
+            $table->json('new_values')->nullable();
+            $table->string('ip_address', 45)->nullable();
+            $table->text('user_agent')->nullable();
+            $table->timestamp('created_at')->useCurrent()->index();
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::dropIfExists('activity_logs');
+    }
+};