fix: 修复一系列问题并生成swagger一键脚本

backend/internal/service/neo4j_service.go

@@ -0,0 +1,13 @@
+package service
+
+import "github.com/neo4j/neo4j-go-driver/v5/neo4j"
+
+// Neo4jService provides graph operations backed by Neo4j.
+type Neo4jService struct {
+	driver neo4j.DriverWithContext
+}
+
+// NewNeo4jService creates a new Neo4j-backed graph service.
+func NewNeo4jService(driver neo4j.DriverWithContext) *Neo4jService {
+	return &Neo4jService{driver: driver}
+}