Image vector embedding

.env.example

@@ -314,6 +314,13 @@ USE_PLAYWRIGHT_FALLBACK=true
 
 MIN_IMAGE_BYTES=3000
 
+# img_vector: a 32x32 RGB pixel thumbnail of each product's primary image,
+# stored on its brand table and computed on a background thread after every
+# catalog write (app/services/image_vector.py). Existing rows are filled by
+# `python -m scripts.backfill_image_vectors --all --apply`. Set false to stop
+# the API process from downloading images at all.
+ENABLE_IMAGE_VECTORS=true
+
 # Product SKU: try a live web search for a real marketplace product ID
 # (Amazon ASIN, Flipkart PID, etc.) before falling back to an internal SKU.
 # Set to false to always generate internal SKUs only (faster, offline-safe).