chore: add settings slash command and bump to 0.4.8

- Add commands/settings.md slash command for unraid_settings tool
- Sync uv.lock after version bump

Co-authored-by: Claude <claude@anthropic.com>

.claude-plugin/plugin.json

@@ -1,7 +1,7 @@
 {
   "name": "unraid",
   "description": "Query and monitor Unraid servers via GraphQL API - array status, disk health, containers, VMs, system monitoring",
-  "version": "0.4.7",
+  "version": "0.4.8",
   "author": {
     "name": "jmagar",
     "email": "jmagar@users.noreply.github.com"