feat: [process] 공정단계 options 컬럼 추가 — 검사 설정/범위 지원

- ProcessStep 모델에 options JSON 컬럼 추가 (fillable, cast)
- Store/UpdateProcessStepRequest에 inspection_setting, inspection_scope 검증 규칙
- process_steps 테이블 마이그레이션

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

database/migrations/2026_03_04_100000_add_options_to_process_steps_table.php

@@ -0,0 +1,23 @@
+<?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('process_steps', function (Blueprint $table) {
+            $table->json('options')->nullable()->after('completion_type')
+                ->comment('검사설정, 검사범위 등 추가 옵션 JSON');
+        });
+    }
+
+    public function down(): void
+    {
+        Schema::table('process_steps', function (Blueprint $table) {
+            $table->dropColumn('options');
+        });
+    }
+};