docs: add iPhone, HEBI and Quest teleoperation to B601-RS community contributions

[ammarjmahmood]

Hi Seeed team, thanks for the reBot.

This adds a Community Contributions table under the B601-RS roadmap, matching the one under B601-DM, with one entry for rebot-phone-teleop. The row is added to all five READMEs, and python tools/check_readme_sync.py passes.

What the project does

Teleoperate the B601-RS by moving a phone or a Quest controller; the gripper follows your hand.

1. Native SwiftUI and ARKit iPhone app: hold the phone upright, thumb on the pad to move, separate gripper strip.
2. HEBI Mobile I/O support for any iPhone without building an app.
3. Meta Quest through WebXR with passthrough.
4. An arm server with a 200 Hz MIT driver over MotorBridge, gravity feedforward, IK on the official RS URDF from this repository, joint limits, gripper settings from the Seeed RS follower config, and safety interlocks (deadman, signal loss stop, latched stop).

The pose mapping follows the phone teleoperation published with TidyBot++ (Wu et al., CoRL 2024), which the project cites. It was tested on a B601-RS with an iPhone 16 Pro Max and is released under MIT; the URDF keeps its CERN OHL W notice.

Happy to adjust the wording or placement.