实现代理节点功能，包括主程序入口、配置加载、心跳检测和状态管理，添加相关服务和API响应结构

atsf_agent/internal/heartbeat/service.go

@@ -0,0 +1,28 @@
+package heartbeat
+
+import (
+	"context"
+
+	"atsflare-agent/internal/protocol"
+)
+
+type Client interface {
+	RegisterNode(ctx context.Context, payload protocol.NodePayload) error
+	Heartbeat(ctx context.Context, payload protocol.NodePayload) error
+}
+
+type Service struct {
+	client Client
+}
+
+func New(client Client) *Service {
+	return &Service{client: client}
+}
+
+func (s *Service) Register(ctx context.Context, payload protocol.NodePayload) error {
+	return s.client.RegisterNode(ctx, payload)
+}
+
+func (s *Service) Heartbeat(ctx context.Context, payload protocol.NodePayload) error {
+	return s.client.Heartbeat(ctx, payload)
+}