feat(scheduling): add expired loyalty cleanup and extend guest anonymization

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

backend/handlers/scheduling/default-hours.go

@@ -317,6 +317,11 @@ func GetAvailableHours(w http.ResponseWriter, r *http.Request) {
 		log.Printf("Failed to anonymize stale guest accounts: %v", err)
 	}
 
+	// Clean up expired loyalty redemptions (pending past expires_at)
+	if err := CleanupExpiredLoyaltyRedemptions(r.Context()); err != nil {
+		log.Printf("Failed to cleanup expired loyalty redemptions: %v", err)
+	}
+
 	// Load default hours
 	defaultMap := map[int]DefaultHours{}
 	defRows, _ := db.DB.Query(r.Context(), `SELECT weekday, start_time::text, end_time::text, is_open FROM working_hours`)