9dcd809778
New /scheme/netcfg/route/flush clears all routes at once: echo > /scheme/netcfg/route/flush Mirrors Linux 'ip route flush all'. Replaces the route table with a new empty RouteTable. All existing Rc shares see the change immediately. Useful for bulk route management (clear and re-add). Notifies route/list subscribers after flush. All 31 tests pass.