feat: replace regime monitor with v2 methodology

frontend/src/api/regime.ts

@@ -11,7 +11,7 @@ export function getRegimeMonitor() {
   return apiClient.get<RegimeMonitor>('regime/monitor').then((r) => r.data);
 }
 
-export function getRegimeHistory(days = 400) {
+export function getRegimeHistory(days = 800) {
   return apiClient
     .get<RegimeHistoryPoint[]>('regime/history', { params: { days } })
     .then((r) => r.data);