Added VR locomotion support for Meta Quest via OpenXR

[SpencerLiang0114]

Summary

• Added XR packages (manifest.json): com.unity.xr.management 4.4.0, com.unity.xr.openxr 1.9.1, com.unity.xr.oculus 4.1.2, and com.unity.inputsystem 1.7.0. Unity auto-configured the corresponding XR and OpenXR project settings.
• Assets/Scripts/Player/VRPlayerController.cs — new locomotion script. Attach to a root XRPlayer GameObject (with CharacterController); the Main Camera should be a child. Left thumbstick moves relative to head direction; right thumbstick X turns. Falls back to WASD + mouse when no headset is active, so the scene is testable in the editor without a device.
• Assets/Editor/VRSceneSetup.cs — editor-only utility. Adds a Forest Simulator → Setup VR Player Rig menu item that re-parents Main Camera under a new XRPlayer root and wires up the CharacterController and VRPlayerController automatically.

To build for Meta Quest

1. Forest Simulator → Setup VR Player Rig (if not done already)
2. Project Settings → XR Plug-in Management → Android tab → enable OpenXR + add Oculus Touch Controller Profile + tick Meta Quest Support
3. File → Build Settings → switch platform to Android → Build & Run

[cuiqui]

Hey @SpencerLiang0114! We'll review the PR in the next few days, thanks for your interest. We'd love to hear how you're using the simulator.