fix: address code review findings

internal/routing/graph.go

@@ -343,7 +343,9 @@ func (g *Graph) FindRoute(originID, destID string, opts SearchOptions, closedSta
 				}
 			}
 		}
-	} // Build adjacency list from edges
+	}
+
+	// Build adjacency list from edges
 	adj := g.buildAdjacencyList()
 
 	// BFS with transfer tracking
@@ -976,7 +978,7 @@ type HubStation struct {
 // rule from the transfer rules, or returns the default MCT.
 func getMCTForTransfer(optsMCT int, g *Graph) int {
 	// Default MCT if no rules match
-	defaultMCT := 1800 // 30 minutes
+	defaultMCT := storage.DefaultMCT // 30 minutes
 
 	// If the user explicitly set an MCT via SearchOptions, prefer that
 	if optsMCT > 0 {
@@ -984,11 +986,10 @@ func getMCTForTransfer(optsMCT int, g *Graph) int {
 	}
 
 	// Try to determine MCT from node types in the graph
-	// This is a simplified lookup; in a full implementation, this would
-	// query the transfer_rules table from the database
+	// In a full implementation, this would query the transfer_rules table
+	// from the database using storage.MinTransferTime(ruleKey, rules, defaultMCT)
+	// For now, return the default MCT.
 
-	// For now, return the default MCT. In a full implementation,
-	// this would query the transfer_rules table.
 	return defaultMCT
 }