feat(go-services): inventory-go search — name/material/set enrichment (exact)

enrichRows now applies the material-name prefix to name (material is already a
translated string in the DB), sets material_name + original_name, and resolves
item_set_name via the AttributeSetInfo enum (fallback "Set {id}").

Validated vs Python position-by-position: 0 mismatches across 60 armor + 60
jewelry rows for name, material_name, item_set_name, original_name, value,
object_class. Sample names match exactly (e.g. "Gold Alduressa Coat").

Remaining enrichment slices: object_class_name (gem context), spells/spell_names
(needs the spells enum map), slot_name (sophisticated), weapon damage/speed/mana,
rating gear-total fallbacks.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

go-services/inventory-go/search.go

@@ -325,10 +325,7 @@ func (s *Server) handleSearchItems(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 
-	items := make([]map[string]any, 0, len(rows))
+	items := s.enrichRows(rows)
-	for _, row := range row2items(rows) {
-		items = append(items, row)
-	}
 
 	writeJSON(w, http.StatusOK, map[string]any{
 		"items":        items,
@@ -340,13 +337,14 @@ func (s *Server) handleSearchItems(w http.ResponseWriter, r *http.Request) {
 	})
 }
 
-// row2items applies the direct-column transforms (computed booleans, condition,
+// enrichRows applies the direct-column transforms (computed booleans, condition,
-// timestamp formatting) and strips internal columns. Deep enrichment is a later
+// timestamp), the material-name prefix, and the item_set name, then strips
-// slice.
+// internal columns. Deeper enrichment (spells, slot_name, weapon damage/mana,
-func row2items(rows []map[string]any) []map[string]any {
+// rating fallbacks) is a later slice.
+func (s *Server) enrichRows(rows []map[string]any) []map[string]any {
+	out := make([]map[string]any, 0, len(rows))
 	for _, row := range rows {
-		cw := toInt64(row["current_wielded_location"])
+		row["is_equipped"] = toInt64(row["current_wielded_location"]) > 0
-		row["is_equipped"] = cw > 0
 		row["is_bonded"] = toInt64(row["bonded"]) > 0
 		row["is_attuned"] = toInt64(row["attuned"]) > 0
 		row["is_rare"] = toInt64(row["rare_id"]) > 0
@@ -359,9 +357,30 @@ func row2items(rows []map[string]any) []map[string]any {
 		if t, ok := row["last_updated"].(time.Time); ok {
 			row["last_updated"] = pyISO(t)
 		}
+
+		// material_name + material prefix on name (material is already a
+		// translated string in the DB; enrich_db_item:2371-2602).
+		if mat := toStr(row["material"]); mat != "" {
+			row["material_name"] = mat
+			if name := toStr(row["name"]); name != "" &&
+				!strings.HasPrefix(strings.ToLower(name), strings.ToLower(mat)) {
+				row["original_name"] = name
+				row["name"] = mat + " " + name
+			}
+		}
+		// item_set_name (enrich_db_item:2551-2562).
+		if iset := strings.TrimSpace(toStr(row["item_set"])); iset != "" {
+			if n, ok := s.attributeSets[iset]; ok {
+				row["item_set_name"] = n
+			} else {
+				row["item_set_name"] = "Set " + iset
+			}
+		}
+
 		delete(row, "db_item_id")
+		out = append(out, row)
 	}
-	return rows
+	return out
 }
 
 // translateSetID mirrors translate_equipment_set_id (AttributeSetInfo lookup,