feat(watchdog): add watchdog service with TCP client implementation

- Implement TCP client for watchdog service communication
- Add watchdog configuration in config.json
- Update main.go to initialize and connect to watchdog
- Add watchdog related functions (connect, command handling)
- Update README.md with new watchdog feature
- Improve route setup logging in router.go

watchdog/command.go

@@ -0,0 +1,33 @@
+package watchdog
+
+import (
+	"fmt"
+)
+
+func AddInstance(serviceName string) bool {
+	if !IsConnected() {
+		return false
+	}
+
+	message := fmt.Sprintf("[addInstance] <serviceName>%s</serviceName>", serviceName)
+	response, err := sendMsg(message, 3)
+	if err != nil {
+		return false
+	}
+
+	return response == "success"
+}
+
+func RemoveInstance(serviceName string) bool {
+	if !IsConnected() {
+		return false
+	}
+
+	message := fmt.Sprintf("[removeInstance] <serviceName>%s</serviceName>", serviceName)
+	response, err := sendMsg(message, 3)
+	if err != nil {
+		return false
+	}
+
+	return response == "success"
+}