feat: add product detail enrichment for Magnit products

- Add isDetailsFetched field to Product model
- Add fetchProductDetails() and fetchProductObjectInfo() methods to MagnitApiScraper
- Add ProductParser methods for detail parsing
- Add ProductService methods: getProductsNeedingDetails(), updateProductDetails(), markAsDetailsFetched()
- Add enrich-product-details.ts script with statistics tracking
- Update package.json with "enrich" script command
- Add E2E_GUIDE.md documentation
- Exclude debug scripts from tsconfig type-check (temporary)

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

tsconfig.json

@@ -17,7 +17,18 @@
     "noEmit": false
   },
   "include": ["src/**/*"],
-  "exclude": ["node_modules", "dist", "generated"],
+  "exclude": [
+    "node_modules",
+    "dist",
+    "generated",
+    "src/scripts/extract-product-from-html.ts",
+    "src/scripts/find-product-detail-api.ts",
+    "src/scripts/find-product-detail-endpoint-v1.ts",
+    "src/scripts/test-detail-endpoint.ts",
+    "src/scripts/test-all-detail-endpoints.ts",
+    "src/scripts/test-object-reviews-endpoint.ts",
+    "src/scripts/debug-detail-response.ts"
+  ],
   "ts-node": {
     "esm": true
   }