feat(watchdog): improve watchdog instance tracking

- Add Close() function to watchdog for graceful shutdown
- Update instance message format for better consistency
- Add watchdog status tracking in StatusInfo
- Include watchdog field in FrpcInstance struct and database
- Change port fields from string to int in FrpcProxyInfo
- Add auth_token support in InstanceInfo

config.go

@@ -27,6 +27,7 @@ type InstanceInfo struct {
 	ServerAddr string                 `json:"serverAddr"`
 	ServerPort string                 `json:"serverPort"`
 	AuthMethod string                 `json:"auth_method"`
+	AuthToken  string                 `json:"auth_token"`
 	RunUser    string                 `json:"runUser"`
 	Additional map[string]interface{} `json:"additionalProperties"`
 }
@@ -35,8 +36,8 @@ type FrpcProxyInfo struct {
 	Name       string `json:"name"`
 	Type       string `json:"type"`
 	LocalIP    string `json:"local_ip"`
-	LocalPort  string `json:"local_port"`
-	RemotePort string `json:"remote_port"`
+	LocalPort  int    `json:"local_port"`
+	RemotePort int    `json:"remote_port"`
 }
 
 type CreateInstanceRequest struct {
@@ -238,6 +239,7 @@ func generateFrpcConfig(info InstanceInfo) string {
 	config.Global["serverAddr"] = info.ServerAddr
 	config.Global["serverPort"] = info.ServerPort
 	config.Global["auth.method"] = info.AuthMethod
+	config.Global["auth.token"] = info.AuthToken
 
 	for key, value := range info.Additional {
 		config.Global[key] = value