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>

static/admin/js/marketplace-letzshop.js

@@ -1375,6 +1375,44 @@ function adminMarketplaceLetzshop() {
         // JOBS TABLE
         // ═══════════════════════════════════════════════════════════════
 
+        /**
+         * Get total pages for jobs pagination
+         */
+        get jobsTotalPages() {
+            return Math.ceil(this.jobsPagination.total / this.jobsPagination.per_page);
+        },
+
+        /**
+         * Get array of page numbers to display for jobs pagination
+         */
+        getPageNumbers() {
+            const total = this.jobsTotalPages;
+            const current = this.jobsPagination.page;
+            const maxVisible = 5;
+
+            if (total <= maxVisible) {
+                return Array.from({length: total}, (_, i) => i + 1);
+            }
+
+            const half = Math.floor(maxVisible / 2);
+            let start = Math.max(1, current - half);
+            let end = Math.min(total, start + maxVisible - 1);
+
+            if (end - start < maxVisible - 1) {
+                start = Math.max(1, end - maxVisible + 1);
+            }
+
+            return Array.from({length: end - start + 1}, (_, i) => start + i);
+        },
+
+        /**
+         * Go to specific page for jobs
+         */
+        goToPage(page) {
+            this.jobsPagination.page = page;
+            this.loadJobs();
+        },
+
         /**
          * Load jobs for selected vendor
          * Note: Jobs are vendor-specific, so we need a vendor selected to show them