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>

models/product.go

@@ -256,6 +256,33 @@ type Subcategory struct {
 	Image           string `json:"image" gorm:"column:image"`
 }
 
+// ImportedCatalogueRef identifies a catalogue product a tenant has already
+// imported. Brand is always included, even when a caller filtered by a
+// single brand, because a bare catalogueid is ambiguous across brand tables.
+type ImportedCatalogueRef struct {
+	Brand       string `json:"brand"`
+	Catalogueid int64  `json:"catalogueid"`
+}
+
+// ImportCatalogueProductRequest is the payload for importing a product from
+// the global catalogue (CatalogueDB) into a tenant's own store catalogue.
+// Brand+Catalogueid is the bridge key back to CatalogueDB: a catalogue row's
+// bare id is only unique within its brand table, so both are required.
+type ImportCatalogueProductRequest struct {
+	Tenantid      int     `json:"tenantid"`
+	Locationid    int     `json:"locationid"`
+	Brand         string  `json:"brand"`
+	Catalogueid   int64   `json:"catalogueid"`
+	Categoryid    int     `json:"categoryid"`
+	Subcategoryid int     `json:"subcategoryid"`
+	Quantity      int     `json:"quantity"`
+	Stocktype     string  `json:"stocktype"`
+	Status        string  `json:"status"`
+	Retailprice   float64 `json:"retailprice"`
+	Productcost   float64 `json:"productcost"`
+	Taxpercent    float64 `json:"taxpercent"`
+}
+
 type Productlocations struct {
 	Productlocationid int     `json:"productlocationid" gorm:"Primary_Key"`
 	Tenantid          int     `json:"tenantid"`