Add persistent named volumes for Desktop Commander

Added four named volumes to preserve state across container restarts:

- dc-system:/usr - System packages, binaries, libraries (npm/pip installs)
- dc-home:/root - User configs, clientId, tool history, feature flags
- dc-workspace:/workspace - Development files and projects
- dc-packages:/var - Package databases, caches, logs

Without these volumes, all installed packages, configuration, and work
is lost when the container stops. This is especially important for users
who install additional tools via npm/pip during their session.

Author: wonderwhy-er

servers/desktop-commander/server.yaml

@@ -25,6 +25,10 @@ source:
 run:
   volumes:
     - "{{desktop-commander.paths|volume|into}}"
+    - dc-system:/usr
+    - dc-home:/root
+    - dc-workspace:/workspace
+    - dc-packages:/var
 config:
   description: Configure filesystem access and network permissions for Desktop Commander
   parameters: