- Add /admin/letzshop/jobs API endpoint for all jobs across vendors
- Update list_letzshop_jobs service to support optional vendor_id
- Remove x-if condition from Jobs tab button and panel
- Update JS to use global or vendor-specific endpoint based on selection
- Update jobs table subtitle to show context
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>