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/react/public/HEROICONS_LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) Tailwind Labs, Inc.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

deps/cloudxr/react/public/arrow-left-start-on-rectangle.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" data-slot="icon">
+  <path fill-rule="evenodd" d="M16.5 3.75a1.5 1.5 0 0 1 1.5 1.5v13.5a1.5 1.5 0 0 1-1.5 1.5h-6a1.5 1.5 0 0 1-1.5-1.5V15a.75.75 0 0 0-1.5 0v3.75a3 3 0 0 0 3 3h6a3 3 0 0 0 3-3V5.25a3 3 0 0 0-3-3h-6a3 3 0 0 0-3 3V9A.75.75 0 1 0 9 9V5.25a1.5 1.5 0 0 1 1.5-1.5h6ZM5.78 8.47a.75.75 0 0 0-1.06 0l-3 3a.75.75 0 0 0 0 1.06l3 3a.75.75 0 0 0 1.06-1.06l-1.72-1.72H15a.75.75 0 0 0 0-1.5H4.06l1.72-1.72a.75.75 0 0 0 0-1.06Z" clip-rule="evenodd"/>
+</svg>

deps/cloudxr/react/public/arrow-uturn-left.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" data-slot="icon">
+  <path fill-rule="evenodd" d="M9.53 2.47a.75.75 0 0 1 0 1.06L4.81 8.25H15a6.75 6.75 0 0 1 0 13.5h-3a.75.75 0 0 1 0-1.5h3a5.25 5.25 0 1 0 0-10.5H4.81l4.72 4.72a.75.75 0 1 1-1.06 1.06l-6-6a.75.75 0 0 1 0-1.06l6-6a.75.75 0 0 1 1.06 0Z" clip-rule="evenodd"/>
+</svg>

deps/cloudxr/react/public/controller-icons.svg

@@ -0,0 +1,13 @@
+<svg width="24" height="24" viewBox="0 0 24 24" xmlns="http://www.w3.org/2000/svg">
+  <!-- Diamond (top-left) -->
+  <polygon points="6,2 10,6 6,10 2,6" fill="black"/>
+  
+  <!-- Triangle (top-right) -->
+  <polygon points="18,2 22,10 14,10" fill="black"/>
+  
+  <!-- Circle (bottom-left) -->
+  <circle cx="6" cy="18" r="4" fill="black"/>
+  
+  <!-- Square (bottom-right) -->
+  <rect x="14" y="14" width="8" height="8" fill="black"/>
+</svg>

deps/cloudxr/react/public/play-circle.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" data-slot="icon">
+  <path fill-rule="evenodd" d="M2.25 12c0-5.385 4.365-9.75 9.75-9.75s9.75 4.365 9.75 9.75-4.365 9.75-9.75 9.75S2.25 17.385 2.25 12Zm14.024-.983a1.125 1.125 0 0 1 0 1.966l-5.603 3.113A1.125 1.125 0 0 1 9 15.113V8.887c0-.857.921-1.4 1.671-.983l5.603 3.113Z" clip-rule="evenodd"/>
+</svg>

deps/cloudxr/react/public/stop-circle.svg

@@ -0,0 +1,3 @@
+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="currentColor" aria-hidden="true" data-slot="icon">
+  <path fill-rule="evenodd" d="M2.25 12c0-5.385 4.365-9.75 9.75-9.75s9.75 4.365 9.75 9.75-4.365 9.75-9.75 9.75S2.25 17.385 2.25 12Zm6-2.438c0-.724.588-1.312 1.313-1.312h4.874c.725 0 1.313.588 1.313 1.313v4.874c0 .725-.588 1.313-1.313 1.313H9.564a1.312 1.312 0 0 1-1.313-1.313V9.564Z" clip-rule="evenodd"/>
+</svg>