add 2nd dev env with JCollab frontend

Author: dlqqq

devenv-jcollab-frontend.yml

@@ -0,0 +1,11 @@
+name: rtccore-jcollab-frontend
+channels:
+  - conda-forge
+dependencies:
+  - python
+  - nodejs=22
+  - uv
+  - jupyterlab
+  - pip:
+      - jupyter_docprovider>=2.0.2,<3
+      - jupyter_collaboration_ui>=2.0.2,<3