implement panic log for gateway and launcher

add file logger to gateway

ref issue: #1734

Signed-off-by: Cytown <cytown@gmail.com>

pkg/logger/panic.go

@@ -0,0 +1,36 @@
+package logger
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime/debug"
+	"time"
+)
+
+func InitPanic(filePath string) (func(), error) {
+	if err := os.MkdirAll(filepath.Dir(filePath), 0o755); err != nil {
+		return nil, fmt.Errorf("failed to create log directory: %w", err)
+	}
+	writer := initPanicFile(filePath)
+	if writer == nil {
+		return nil, fmt.Errorf("failed to create log file: %s", filePath)
+	}
+	return func() {
+		defer writer.Close()
+		if err := recover(); err != nil {
+			now := time.Now().Format("2006-01-02 15:04:05")
+			stack := debug.Stack()
+			logMsg := "\n\n====================\n[" + now + "] PANIC OCCURRED: " + fmt.Sprintf(
+				"%v",
+				err,
+			) + "\n" + string(
+				stack,
+			)
+
+			writer.Write([]byte(logMsg))
+
+			os.Exit(1)
+		}
+	}, nil
+}