fix: add error logging to remaining nolint:errcheck scan sites for observability

backend/handlers/admin/custom_services.go

@@ -7,6 +7,7 @@ import (
 	"database/sql"
 	"encoding/json"
 	"errors"
+	"log"
 	"log/slog"
 	"net/http"
 	"strconv"
@@ -167,13 +168,15 @@ func GetCustomServices(w http.ResponseWriter, r *http.Request) {
 	// so pgx does not return "conn busy" on the same transaction.
 	if q != "" {
 		var countTotal int64
-//nolint:errcheck // zero value is acceptable fallback on scan failure
-		_ = db.Conn.QueryRow(r.Context(), "SELECT COUNT(*) FROM custom_services WHERE name ILIKE $1 OR description ILIKE $1", "%"+q+"%").Scan(&countTotal)
+		if err := db.Conn.QueryRow(r.Context(), "SELECT COUNT(*) FROM custom_services WHERE name ILIKE $1 OR description ILIKE $1", "%"+q+"%").Scan(&countTotal); err != nil {
+			log.Printf("Failed to scan filtered custom services count: %v", err)
+		}
 		total = countTotal
 	} else {
 		var countTotal int64
-//nolint:errcheck // zero value is acceptable fallback on scan failure
-		_ = db.Conn.QueryRow(r.Context(), "SELECT COUNT(*) FROM custom_services").Scan(&countTotal)
+		if err := db.Conn.QueryRow(r.Context(), "SELECT COUNT(*) FROM custom_services").Scan(&countTotal); err != nil {
+			log.Printf("Failed to scan custom services count: %v", err)
+		}
 		total = countTotal
 	}