feat: add View Parent Company link to vendor detail page

- Add "View Parent Company" button in More Actions section
- Show parent company name in info text
- Add deleteVendor function to vendor-edit.js

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

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

static/admin/js/vendor-edit.js

@@ -213,6 +213,47 @@ function adminVendorEdit() {
             } finally {
                 this.saving = false;
             }
+        },
+
+        // Delete vendor
+        async deleteVendor() {
+            editLog.info('Delete vendor requested');
+
+            const vendorName = this.vendor?.name || this.vendorCode;
+            if (!confirm(`Are you sure you want to delete "${vendorName}"?\n\n⚠️ WARNING: This will permanently delete:\n• All products\n• All orders\n• All customers\n• All team members\n\nThis action cannot be undone!`)) {
+                editLog.info('Delete cancelled by user');
+                return;
+            }
+
+            // Double confirmation for safety
+            if (!confirm(`FINAL CONFIRMATION\n\nType OK to permanently delete "${vendorName}" and ALL associated data.`)) {
+                editLog.info('Delete cancelled at final confirmation');
+                return;
+            }
+
+            this.saving = true;
+            try {
+                const url = `/admin/vendors/${this.vendorCode}?confirm=true`;
+                window.LogConfig.logApiCall('DELETE', url, null, 'request');
+
+                const response = await apiClient.delete(url);
+
+                window.LogConfig.logApiCall('DELETE', url, response, 'response');
+
+                Utils.showToast('Vendor deleted successfully', 'success');
+                editLog.info('Vendor deleted successfully');
+
+                // Redirect to vendors list
+                setTimeout(() => {
+                    window.location.href = '/admin/vendors';
+                }, 1500);
+
+            } catch (error) {
+                window.LogConfig.logError(error, 'Delete Vendor');
+                Utils.showToast(error.message || 'Failed to delete vendor', 'error');
+            } finally {
+                this.saving = false;
+            }
         }
     };
 }