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>

uv.lock

@@ -1535,7 +1535,7 @@ wheels = [
 
 [[package]]
 name = "unraid-mcp"
-version = "0.4.4"
+version = "0.4.7"
 source = { editable = "." }
 dependencies = [
     { name = "fastapi" },