Refactor for interface clarity and dependency isolation.

Replaced inline interface literals with dedicated, documented interface definitions in `pkg/interfaces/`. Introduced `TimeoutError`, `PolicyChecker`, and `Neo4jResultIterator` interfaces to clarify design, improve maintainability, and resolve potential circular dependencies. Updated config and constant usage rules for consistency. Incremented version to v0.31.11.

pkg/interfaces/resultiter/resultiter.go

@@ -0,0 +1,16 @@
+// Package resultiter defines interfaces for iterating over database query results.
+package resultiter
+
+import (
+	"context"
+
+	"github.com/neo4j/neo4j-go-driver/v5/neo4j"
+)
+
+// Neo4jResultIterator defines the interface for iterating over Neo4j query results.
+// This is implemented by both neo4j.Result and CollectedResult types.
+type Neo4jResultIterator interface {
+	Next(context.Context) bool
+	Record() *neo4j.Record
+	Err() error
+}