feat: [departments] options JSON 컬럼 추가

- 조직도 숨기기 등 확장 속성 저장용

database/migrations/2026_03_06_201500_add_options_to_departments_table.php

@@ -0,0 +1,22 @@
+<?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::table('departments', function (Blueprint $table) {
+            $table->json('options')->nullable()->after('sort_order');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('departments', function (Blueprint $table) {
+            $table->dropColumn('options');
+        });
+    }
+};