feat: Enhance mold management functionality

- Added new `updateMoldSerial` API endpoint for updating mold serial details.
- Modified existing mold-related SQL queries to include `id` and `created_date` fields.
- Updated frontend to handle mold serial updates and image uploads.
- Improved subcontractor management table with additional fields and rendering logic.

This update improves the overall functionality and user experience in managing molds and subcontractors.

.gitignore

@@ -1,6 +1,9 @@
 # Claude Code
 .claude/
 
+# Test checklists
+docs/test-checklists/
+
 # Dependencies
 node_modules/
 jspm_packages/