fix(shutdown): force-stop on second SIGINT during countdown

A second Ctrl+C/SIGINT while the 10-second shutdown countdown is
running now exits immediately instead of being silently dropped.
The signal channel is buffered to 2 so the second signal is captured,
and the countdown select exits via os.Exit(1) on receipt.

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Fixed
 
+- A second SIGINT/Ctrl+C during the shutdown countdown now force-stops the server immediately
 - Fixed `ecdMagic` constant byte order causing encryption failures on some platforms ([#174](https://github.com/Mezeporta/Erupe/issues/174))
 - Fixed guild nil panics: variable shadowing causing nil panic in scout list ([#171](https://github.com/Mezeporta/Erupe/issues/171))
 - Fixed guild nil panics: added nil guards in cancel and answer scout handlers ([#171](https://github.com/Mezeporta/Erupe/issues/171))

main.go

@@ -388,9 +388,9 @@ func main() {
 	logger.Info("Finished starting Erupe")
 
 	// Wait for exit or interrupt with ctrl+C.
-	c := make(chan os.Signal, 1)
-	signal.Notify(c, os.Interrupt, syscall.SIGTERM)
-	<-c
+	sig := make(chan os.Signal, 2)
+	signal.Notify(sig, os.Interrupt, syscall.SIGTERM)
+	<-sig
 
 	if !config.DisableSoftCrash {
 		for i := 0; i < 10; i++ {
@@ -399,7 +399,12 @@ func main() {
 				c.BroadcastChatMessage(message)
 			}
 			logger.Info(message)
-			time.Sleep(time.Second)
+			select {
+			case <-sig:
+				logger.Info("Second signal received, forcing shutdown")
+				os.Exit(1)
+			case <-time.After(time.Second):
+			}
 		}
 	}