Major improvements to tenant management:
1. Dynamic field display - Product lists now automatically show all custom fields based on tenant configuration (e.g., inventory, custom attributes)
2. Fixed Jinja2 template scoping issue - Product field values now correctly display in edit forms using selectattr filter
3. Simplified URL structure - Removed redundant /tenant/admin/ routes, all product management now at /tenant/ root
4. Enhanced tenant landing page - Added delete functionality with confirmation modal, shows all custom fields except images
5. Updated all routes and redirects to use simplified paths (/tenant/add, /tenant/edit, etc.)
This consolidates the interface so /tenant/ serves as the main dashboard with full product management capabilities, while /tenant/settings handles configuration.
Fixed two issues with product images:
1. Images weren't being preserved when editing other product fields - added logic to keep existing image value when no new image is uploaded
2. Image URLs had double underscores (e.g., /images/123__image.jpg) due to field names starting with underscore - now strips leading underscore from field name when constructing image paths
