fix: taskModel DB 연결 및 API 응답 형식 수정

- taskModel.js: ../db/connection → ../dbPool로 수정
- dailyWorkReportController.js: getWorkTypes 응답 형식 표준화
  - res.json(data) → res.json({ success: true, data, message })

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

api.hyungi.net/models/taskModel.js

@@ -5,7 +5,7 @@
  * @since 2026-01-26
  */
 
-const { getDb } = require('../db/connection');
+const { getDb } = require('../dbPool');
 
 // ==================== 작업 CRUD ====================