refactor: add missing defers and handle error returned by bot.Run gracefully

cmd/dcbot/internal/run/run.go

@@ -37,6 +37,9 @@ func New() *cli.Command {
 			if err != nil {
 				return fmt.Errorf("internal.NewBunDB: %w", err)
 			}
+			defer func() {
+				_ = db.Close()
+			}()
 
 			client, err := internal.NewTWHelpClient(c.App.Version)
 			if err != nil {
@@ -67,7 +70,12 @@ func New() *cli.Command {
 			}
 
 			go func() {
-				_ = bot.Run()
+				if runErr := bot.Run(); runErr != nil {
+					logger.Fatal("bot.Run: " + runErr.Error())
+				}
+			}()
+			defer func() {
+				_ = bot.Close()
 			}()
 
 			if err = os.WriteFile(healthyFilePath, []byte("healthy"), healthyFilePerm); err != nil {
@@ -78,10 +86,6 @@ func New() *cli.Command {
 
 			waitForSignal(c.Context)
 
-			if err = bot.Close(); err != nil {
-				return fmt.Errorf("bot.Close: %w", err)
-			}
-
 			return nil
 		},
 	}