style: gofmt the tree

gofmt -l reported 13 files with misaligned struct tags / stale formatting.
This commit contains ONLY formatting: no behaviour change, no logic touched.
Files that also carry real changes in this series are formatted by their own
commits.

cmd/llmsproxy/main.go

@@ -88,4 +88,4 @@ func main() {
 	signal.Notify(stop, syscall.SIGINT, syscall.SIGTERM)
 	<-stop
 	log.Printf("[llmsproxy] shutting down")
-}
+}