feat: import both confirmed and declined orders in historical import

Historical import now fetches:
- state=confirmed -> sync_status='confirmed'
- state=declined -> sync_status='rejected'

Stats are combined from both API calls.

🤖 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

@@ -454,7 +454,7 @@ function adminMarketplaceLetzshop() {
         },
 
         /**
-         * Import historical orders from Letzshop (all confirmed orders)
+         * Import historical orders from Letzshop (confirmed and declined orders)
          */
         async importHistoricalOrders() {
             if (!this.selectedVendor || !this.letzshopStatus.is_configured) return;
@@ -465,16 +465,31 @@ function adminMarketplaceLetzshop() {
             this.historicalImportResult = null;
 
             try {
-                const response = await apiClient.post(
+                // Import confirmed orders
+                const confirmedResponse = await apiClient.post(
                     `/admin/letzshop/vendors/${this.selectedVendor.id}/import-history?state=confirmed`
                 );
+                const confirmedStats = confirmedResponse.statistics || confirmedResponse;
 
-                // Stats are nested under 'statistics' key
+                // Import declined (rejected) orders
-                this.historicalImportResult = response.statistics || response;
+                const declinedResponse = await apiClient.post(
+                    `/admin/letzshop/vendors/${this.selectedVendor.id}/import-history?state=declined`
+                );
+                const declinedStats = declinedResponse.statistics || declinedResponse;
+
+                // Combine stats
+                this.historicalImportResult = {
+                    imported: (confirmedStats.imported || 0) + (declinedStats.imported || 0),
+                    updated: (confirmedStats.updated || 0) + (declinedStats.updated || 0),
+                    skipped: (confirmedStats.skipped || 0) + (declinedStats.skipped || 0),
+                    products_matched: (confirmedStats.products_matched || 0) + (declinedStats.products_matched || 0),
+                    products_not_found: (confirmedStats.products_not_found || 0) + (declinedStats.products_not_found || 0),
+                };
                 const stats = this.historicalImportResult;
                 this.successMessage = `Historical import complete: ${stats.imported} imported, ${stats.updated} updated`;
 
-                marketplaceLetzshopLog.info('Historical import result:', response);
+                marketplaceLetzshopLog.info('Historical import result (confirmed):', confirmedResponse);
+                marketplaceLetzshopLog.info('Historical import result (declined):', declinedResponse);
 
                 // Reload orders to show new data
                 await this.loadOrders();