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/connect.go

@@ -0,0 +1,47 @@
+package watchdog
+
+import (
+	"time"
+)
+
+func Connect(ipaddr string, port int) bool {
+	if IsConnected() {
+		return true
+	}
+
+	if err := Init(); err != nil {
+		return false
+	}
+
+	if err := tcpConnect(ipaddr, port); err != nil {
+		return false
+	}
+
+	response, err := sendMsg("watchdogAgentConnectionTest", 3)
+	if err != nil {
+		Destroy()
+		return false
+	}
+
+	if response != "success" {
+		Destroy()
+		return false
+	}
+
+	return true
+}
+
+func Disconnect() bool {
+	if !IsConnected() {
+		return true
+	}
+
+	err := Destroy()
+	if err != nil {
+		return false
+	}
+
+	time.Sleep(100 * time.Millisecond)
+
+	return true
+}