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/scripts/test-crawl-to-canonical.ts

@@ -23,6 +23,7 @@ import {
   DutchieNormalizer,
   hydrateToCanonical,
 } from '../hydration';
+import { initializeImageStorage } from '../utils/image-storage';
 
 dotenv.config();
 
@@ -137,6 +138,11 @@ async function main() {
   console.log(`Test Crawl to Canonical - Dispensary ${dispensaryId}`);
   console.log('============================================================\n');
 
+  // Initialize image storage
+  console.log('[Init] Initializing image storage...');
+  await initializeImageStorage();
+  console.log('  Image storage ready\n');
+
   try {
     // Step 1: Get dispensary info
     console.log('[Step 1] Getting dispensary info...');