feat(API): 공정 options JSON 컬럼 마이그레이션

- needs_work_log 개별 컬럼 → options JSON 구조로 전환
- StoreProcessRequest, UpdateProcessRequest 유효성 규칙 갱신
- Process 모델 $fillable, $casts 갱신

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

app/Models/Process.php

@@ -28,8 +28,8 @@ class Process extends Model
         'department',
         'work_log_template',
         'document_template_id',
-        'needs_work_log',
         'work_log_template_id',
+        'options',
         'required_workers',
         'equipment_info',
         'work_steps',
@@ -43,7 +43,7 @@ class Process extends Model
     protected $casts = [
         'work_steps' => 'array',
         'is_active' => 'boolean',
-        'needs_work_log' => 'boolean',
+        'options' => 'array',
         'required_workers' => 'integer',
     ];