Add ClockSyncConfigurator for Unitree WebRTC clock synchronization

[leshy]

Problem

Unitree WebRTC connections require clock sync within 100ms between the control computer and the robot. Currently there's no automated check — if clocks drift, our video and odom look bad in replay

Solution

Utilize Blueprint.requirements() and SystemConfigurator to implement automatic clock sync checks

Wire into unitree_go2_basic and unitree_g1_basic blueprints via .requirements().