feat: 增加对neo4j的增改查

backend/services/service.go

@@ -8,4 +8,12 @@ type GraphService interface {
 	SearchNodes(query string) []models.Node
 	GetNeighbors(nodeID string) (models.NeighborResponse, bool)
 	GetStats() map[string]int
+
+	// 新增增删改接口
+	CreateNode(req models.CreateNodeRequest) (models.Node, error)
+	UpdateNode(id string, req models.UpdateNodeRequest) (models.Node, error)
+	DeleteNode(id string) error
+
+	CreateEdge(req models.CreateEdgeRequest) (models.Edge, error)
+	DeleteEdge(id string) error
 }