ai insight rework #3, add root cause to daily ai insight

types/api.ts

@@ -337,6 +337,7 @@ export type InsightApiResponse = {
   success?: boolean;
   insight_text: string;
   summary?: string;
+  akar_masalah?: string;
   insight?: string;
   structured?: InsightStructuredReport | null;
   structured_end_cycle?: EndCycleStructuredInsight | null;