feat: Implement node management features including creation, updating, and deletion

- Added CreateNode, UpdateNode, and DeleteNode functions in the controller for managing nodes.
- Introduced NodeInput struct for input validation during node creation and updates.
- Enhanced the Node model to include DiscoveryToken and Pending status.
- Updated the AgentRegister and AgentHeartbeat functions to utilize the new node management logic.
- Refactored the API router to include new routes for node management.
- Improved the frontend Node component to support node creation, editing, and deletion with appropriate UI feedback.
- Added tests to ensure the new functionality works as expected.

atsf_agent/internal/protocol/agent_api.go

@@ -16,6 +16,12 @@ type NodePayload struct {
 	LastError      string `json:"last_error"`
 }
 
+type RegisterNodeResponse struct {
+	NodeID     string `json:"node_id"`
+	AgentToken string `json:"agent_token"`
+	Name       string `json:"name"`
+}
+
 type ApplyLogPayload struct {
 	NodeID  string `json:"node_id"`
 	Version string `json:"version"`