Feature/inv 8 template generation from individual items kits or

[chapman-w]

Added shared inventory templates so users can create templates and populate them from existing team inventory to reduce redundant data entry. Users also have the ability to create new items or kits from scratch for a new template.

Backend includes a full templates router with CRUD and cross-team listing. Frontend includes a /templates page and template detail page where you can add and remove items from existing teams.

How to test:

• Go to Teamspaces → Templates and create a template
• Click into it, add items from an existing team and verify they appear without serial numbers or quantities
• Add new items/kits from scratch and verify they appear
• Remove an item and delete the template

[chpy04]

lgtm