Bridge global catalogue DB to per-store product catalogue

Adds a separate CatalogueDB (pgvector) connection alongside the main
nearledb, plus a new catalogue module (repository/service/controller/
routes) to browse it by brand, category, and keyword, with brand
optional so the whole ~237-product catalogue can be browsed unfiltered.

Adds the actual bridge: importing a catalogue product snapshots it into
the tenant's own products table (keyed on brand+catalogueid, since a
catalogue row's bare id is only unique within its own brand table),
then links it via the existing productlocations upsert. Re-importing
tops up stock and refreshes price instead of duplicating. Also adds an
imported-refs endpoint so the frontend can badge already-imported items
without diffing full product lists, and wires the new AWS S3 image
store used to resolve catalogue product photos.

Bumps Go/Docker to 1.24 for the AWS SDK dependency this needs.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

.env

@@ -4,3 +4,18 @@ DB_PORT=5433
 DB_NAME=nearledb
 DB_USER=admin
 DB_PASSWORD="Package@123#"
+
+# --- Catalogue Postgres / pgvector (separate DB, read-only integration) ---
+CATALOGUE_DB_HOST=31.97.228.132
+CATALOGUE_DB_PORT=6054
+CATALOGUE_DB_NAME=pgvector
+CATALOGUE_DB_USER=admin
+CATALOGUE_DB_PASSWORD="'Package@321#'"
+
+# --- DigitalOcean Spaces (S3-compatible), catalogue product images ---
+USE_S3=true
+S3_ACCESS_KEY=DO801G8Q8JAZKF49U3WJ
+S3_SECRET_KEY=lBQExYfkVqH+ybmGVmQH5MkThBbrIohA/VQLgcPUvug
+S3_ENDPOINT=https://nearle.sgp1.digitaloceanspaces.com
+S3_BUCKET=nearle
+S3_REGION=sgp1