Add CloudXR VR streaming support for PICO 4 Ultra (Early Access)

Replaces manual H264/TCP stereo streaming with NVIDIA CloudXR for
higher-quality stereoscopic rendering and lower latency.

Changes:
- teleop_xr_agent.py: add --cloudxr flag (enables Isaac Sim XR mode,
  disables manual StreamingManager)
- deps/cloudxr/: NVIDIA CloudXR.js SDK (Early Access) with Isaac Lab
  teleop React web client
- deps/cloudxr/Dockerfile.wss.proxy: HAProxy WSS proxy for PICO 4 Ultra
  HTTPS mode (routes wss://48322 → ws://49100)
- deps/cloudxr/isaac/webpack.dev.js: disable file watching to avoid
  EMFILE errors with large node_modules
- deps/cloudxr/INSTALL.md: full setup guide

Usage:
  # Start CloudXR Runtime + Isaac Lab
  cd ~/IsaacLab && ./docker/container.py start \
      --files docker-compose.cloudxr-runtime.patch.yaml \
      --env-file .env.cloudxr-runtime

  # Run teleop with CloudXR
  ~/IsaacLab/isaaclab.sh -p teleop_xr_agent.py \
      --task Isaac-MindRobot-2i-DualArm-IK-Abs-v0 --cloudxr

  # Serve web client
  cd deps/cloudxr/isaac && npm run dev-server:https

deps/cloudxr/README.md

@@ -0,0 +1,71 @@
+# NVIDIA CloudXR.js SDK - Getting Started
+
+> **Note:** For detailed documentation, see the `docs/` folder (open `docs/index.html` in browser).
+
+[The NVIDIA CloudXR.js SDK](#) enables developers to build web clients that stream high-quality spatial content from CloudXR servers with powerful GPUs to web browsers on XR devices. It consists of:
+ - **CloudXR.js SDK** - a JavaScript client library
+ - **WebGL-based simple sample client** that uses core Web APIs (WebGL, WebXR)
+ - **React-based sample client** that uses the R3F (React-Three-Fiber) framework stack
+
+<!-- #region firstRunGuide -->
+
+It is *strongly recommended* that you work through this guide if you have never run CloudXR.js before.
+
+## The Pieces of a CloudXR.js Deployment
+
+Even for development, you'll need all the pieces of a CloudXR.js deployment in order to build and test a client. These are:
+
+- a CloudXR Server
+  - with a _top-end_ NVIDIA GPU or 2 (e.g. dual RTX 6000 Ada)
+  - which will run
+    - the CloudXR Runtime
+    - an OpenXR application (the thing you want to render on the server but see on the client)
+- a CloudXR.js development workstation
+  - with Node.js and `npm`
+  - which will run
+    - the CloudXR.js sample client build
+    - a Node-based development web server
+- a CloudXR.js client
+  - which is one of:
+    - a Meta Quest 3 with its built-in Browser app
+    - a desktop browser: [Google Chrome](https://www.google.com/chrome) or Edge (IWER automatically loads for WebXR emulation)
+  - which will run...
+    - the CloudXR.js sample client *served from the development web server*.
+
+We *recommend* that for your first experience, all above run on *the same computer* to eliminate networking related issues.
+
+## High Level Workflow
+
+You need both a working client and a working server in order to test. Typically we follow a startup flow where server starts before the client:
+
+1. CloudXR Runtime
+2. Server XR application
+3. Sample client build + web server
+4. Test from the same computer
+5. Test from Quest 3 or a different computer
+
+<!-- #endregion firstRunGuide -->
+
+Please refer to [the CloudXR.js SDK documentations](#sdk-documentation) for details.
+
+## SDK Documentation
+
+The `docs/` folder contains comprehensive documentation including:
+- Getting Started guides with example server applications
+- API reference for building custom clients
+- Common issues and solutions
+
+Open `docs/index.html` in your browser for organized navigation with table of contents.
+
+## Support
+
+For technical support and questions about this early access release:
+- Review the troubleshooting sections in the SDK documentation
+- Study the example implementations for integration patterns
+- Contact the NVIDIA CloudXR team for additional assistance
+
+## License
+
+> **Important**: This is an [evaluation license](LICENSE) for internal test and evaluation purposes only. For commercial use, please contact NVIDIA for appropriate licensing terms.
+
+> **Note**: This is an early access release of CloudXR.js. Features and APIs may change in future releases.