feat: enhance Letzshop jobs and order management

- Add job cancellation and retry functionality
- Improve jobs table with better status display
- Add background task improvements
- Update Letzshop order service
- Update documentation

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

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/implementation/letzshop-jobs-improvements.md

@@ -2,10 +2,14 @@
 
 Implementation plan for improving the Letzshop management page jobs display and table harmonization.
 
-## Status: In Progress
+## Status: Completed
 
 ### Completed
 - [x] Phase 1: Job Details Modal (commit cef80af)
+- [x] Phase 2: Add vendor column to jobs table
+- [x] Phase 3: Platform settings system (rows per page)
+- [x] Phase 4: Numbered pagination for jobs table
+- [x] Phase 5: Admin customer management page
 
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