feat: initial VRRP implementation with health checking

- VRRP protocol implementation (RFC 3768/5798)
- Virtual IP management (add/remove VIPs)
- State machine (INIT/BACKUP/MASTER/FAULT)
- Priority-based master election
- Gratuitous ARP for network updates
- Health checking (TCP, HTTP, ICMP, Script)
- Configuration hot-reload (SIGHUP)

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pkg/logger/logger.go

@@ -0,0 +1,44 @@
+package logger
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"time"
+)
+
+type Logger struct {
+	debug  bool
+	logger *log.Logger
+}
+
+func New(debug bool) *Logger {
+	return &Logger{
+		debug:  debug,
+		logger: log.New(os.Stdout, "", 0),
+	}
+}
+
+func (l *Logger) Info(format string, args ...interface{}) {
+	l.log("INFO", format, args...)
+}
+
+func (l *Logger) Error(format string, args ...interface{}) {
+	l.log("ERROR", format, args...)
+}
+
+func (l *Logger) Debug(format string, args ...interface{}) {
+	if l.debug {
+		l.log("DEBUG", format, args...)
+	}
+}
+
+func (l *Logger) Warn(format string, args ...interface{}) {
+	l.log("WARN", format, args...)
+}
+
+func (l *Logger) log(level string, format string, args ...interface{}) {
+	timestamp := time.Now().Format("2006-01-02 15:04:05")
+	message := fmt.Sprintf(format, args...)
+	l.logger.Printf("[%s] %s: %s", timestamp, level, message)
+}