fix: complete image pipeline - rotation, URL, preview

- Add rotation_degrees parameter to ImageProcessor.process_photo()
- Pass rotation through _auto_save_photo_from_extraction() to processor
- Allow no-crop fallback when crop_bounds is None
- Add buildPhotoUrl() helper to resolve backend URLs correctly
- Update frontend components to use backend URL for image sources
- Replace Use/Skip Photo buttons with checkbox in AI extraction UI
- Add images/ to .gitignore to prevent accidental commits

Addresses: rotation never applied, image 404s (relative to Next.js not backend), preview blank in edit form

frontend/components/InventoryTable.tsx

@@ -2,6 +2,7 @@
 
 import { useState } from 'react';
 import { Item } from '@/lib/db';
+import { buildPhotoUrl } from '@/lib/api';
 import { ChevronRight, ChevronDown, Layers, Package } from 'lucide-react';
 import { clsx, type ClassValue } from 'clsx';
 import { twMerge } from 'tailwind-merge';
@@ -20,6 +21,7 @@ interface InventoryTableProps {
   onItemClick: (item: Item) => void;
   onEditCategory?: (category: string) => void;
   categoriesList?: any[];
+  backendUrl?: string;
 }
 
 export default function InventoryTable({
@@ -29,7 +31,8 @@ export default function InventoryTable({
   onExpandCategory,
   onItemClick,
   onEditCategory,
-  categoriesList = []
+  categoriesList = [],
+  backendUrl = ''
 }: InventoryTableProps) {
   const [selectedItemDetail, setSelectedItemDetail] = useState<Item | null>(null);
   const [refreshTrigger, setRefreshTrigger] = useState(0);
@@ -115,7 +118,7 @@ export default function InventoryTable({
                           className="w-12 h-12 rounded-xl shrink-0 border-2 border-slate-300 overflow-hidden cursor-pointer hover:border-primary transition-colors active:scale-95"
                         >
                           <img
-                            src={item.photo_path || item.image_url || ''}
+                            src={buildPhotoUrl(backendUrl, item.photo_path || item.image_url || '')}
                             alt={item.name}
                             className="w-full h-full object-cover"
                             loading="lazy"
@@ -160,6 +163,7 @@ export default function InventoryTable({
           item={selectedItemDetail}
           onClose={handleCloseDetail}
           onItemRefresh={handleItemRefresh}
+          backendUrl={backendUrl}
         />
       )}