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

app/Models/ActivityLog.php

@@ -0,0 +1,31 @@
+<?php
+
+namespace App\Models;
+
+use Illuminate\Database\Eloquent\Model;
+
+class ActivityLog extends Model
+{
+    protected $fillable = [
+        'user_id', 'user_name', 'action', 'description',
+        'subject_type', 'subject_id', 'ip_address',
+    ];
+
+    public static function record(string $action, string $description, ?string $subjectType = null, $subjectId = null): void
+    {
+        static::create([
+            'user_id'      => auth()->id(),
+            'user_name'    => auth()->user()?->name,
+            'action'       => $action,
+            'description'  => $description,
+            'subject_type' => $subjectType,
+            'subject_id'   => $subjectId !== null ? (string) $subjectId : null,
+            'ip_address'   => request()->ip(),
+        ]);
+    }
+
+    public function user()
+    {
+        return $this->belongsTo(User::class);
+    }
+}

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');
+    }
+};