fix: use Record<string,any> for task body to allow boolean showDate

Co-authored-by: Cursor <cursoragent@cursor.com>

backend/src/routes/tasks.ts

@@ -57,7 +57,7 @@ router.post('/', async (req, res, next) => {
   try {
     const { title, description, status, priority, quarter, category,
             section, tag, taskType, progress, issueNote, startDate, dueDate, assigneeId, showDate } =
-      req.body as Record<string, string>;
+      req.body as Record<string, any>;
 
     if (!title || !quarter) {
       throw new AppError(400, '제목과 분기는 필수입니다.');