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-image-proxy.ts

@@ -0,0 +1,80 @@
+#!/usr/bin/env npx tsx
+/**
+ * Test Image Proxy - Standalone test without backend
+ *
+ * Usage:
+ *   npx tsx src/scripts/test-image-proxy.ts
+ */
+
+import express from 'express';
+import imageProxyRoutes from '../routes/image-proxy';
+
+const app = express();
+const PORT = 3099;
+
+// Mount the image proxy
+app.use('/img', imageProxyRoutes);
+
+// Start server
+app.listen(PORT, async () => {
+  console.log(`Test image proxy running on http://localhost:${PORT}`);
+  console.log('');
+  console.log('Testing image proxy...');
+  console.log('');
+
+  const axios = require('axios');
+
+  // Test cases
+  const tests = [
+    {
+      name: 'Original image',
+      url: '/img/products/az/az-deeply-rooted/clout-king/68b4b20a0f9ef3e90eb51e96/image-268a6e44.webp',
+    },
+    {
+      name: 'Resize to 200px width',
+      url: '/img/products/az/az-deeply-rooted/clout-king/68b4b20a0f9ef3e90eb51e96/image-268a6e44.webp?w=200',
+    },
+    {
+      name: 'Resize to 100x100 cover',
+      url: '/img/products/az/az-deeply-rooted/clout-king/68b4b20a0f9ef3e90eb51e96/image-268a6e44.webp?w=100&h=100&fit=cover',
+    },
+    {
+      name: 'Grayscale + blur',
+      url: '/img/products/az/az-deeply-rooted/clout-king/68b4b20a0f9ef3e90eb51e96/image-268a6e44.webp?w=200&gray=1&blur=2',
+    },
+    {
+      name: 'Convert to JPEG',
+      url: '/img/products/az/az-deeply-rooted/clout-king/68b4b20a0f9ef3e90eb51e96/image-268a6e44.webp?w=200&format=jpeg&q=70',
+    },
+    {
+      name: 'Non-existent image',
+      url: '/img/products/az/nonexistent/image.webp',
+    },
+  ];
+
+  for (const test of tests) {
+    try {
+      const response = await axios.get(`http://localhost:${PORT}${test.url}`, {
+        responseType: 'arraybuffer',
+        validateStatus: () => true,
+      });
+
+      const contentType = response.headers['content-type'];
+      const size = response.data.length;
+      const status = response.status;
+
+      console.log(`${test.name}:`);
+      console.log(`  URL: ${test.url.slice(0, 80)}${test.url.length > 80 ? '...' : ''}`);
+      console.log(`  Status: ${status}`);
+      console.log(`  Content-Type: ${contentType}`);
+      console.log(`  Size: ${(size / 1024).toFixed(1)} KB`);
+      console.log('');
+    } catch (error: any) {
+      console.log(`${test.name}: ERROR - ${error.message}`);
+      console.log('');
+    }
+  }
+
+  console.log('Tests complete!');
+  process.exit(0);
+});