feat(images): Add local image storage with on-demand resizing

- Store product images locally with hierarchy: /images/products/<state>/<store>/<brand>/<product>/
- Add /img/* proxy endpoint for on-demand resizing via Sharp
- Implement per-product image checking to skip existing downloads
- Fix pathToUrl() to correctly generate /images/... URLs
- Add frontend getImageUrl() helper with preset sizes (thumb, medium, large)
- Update all product pages to use optimized image URLs
- Add stealth session support for Dutchie GraphQL crawls
- Include test scripts for crawl and image verification

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

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

backend/src/platforms/dutchie/index.ts

@@ -18,6 +18,13 @@ export {
   getFingerprint,
   rotateFingerprint,
   resetFingerprint,
+  getRandomFingerprint,
+  getLocaleForTimezone,
+
+  // Session Management (per-store fingerprint rotation)
+  startSession,
+  endSession,
+  getCurrentSession,
 
   // Proxy
   setProxy,
@@ -32,6 +39,7 @@ export {
   // Types
   type CurlResponse,
   type Fingerprint,
+  type CrawlSession,
   type ExecuteGraphQLOptions,
   type FetchPageOptions,
 } from './client';