fix FE 96h forecast

frontend/src/api/backend.ts

@@ -99,6 +99,24 @@ export async function getCurrentPlan(siteId: number): Promise<CurrentPlanRespons
   return data
 }
 
+/** Řada FVE předpovědi (součet polí) po 15 min — doplnění grafu za horizont uloženého plánu. */
+export type ForecastPvSlotRow = {
+  interval_start: string
+  pv_forecast_total_w?: number | null
+}
+
+export async function getForecastPvSlotsRange(
+  siteId: number,
+  fromIso: string,
+  toIso: string,
+): Promise<ForecastPvSlotRow[]> {
+  const { data } = await client.get<{ slots?: ForecastPvSlotRow[] }>(
+    `/sites/${siteId}/forecast/pv-slots`,
+    { params: { from: fromIso, to: toIso }, timeout: 45_000 },
+  )
+  return Array.isArray(data?.slots) ? data.slots : []
+}
+
 /** GET /api/v1/sites/{id}/prices?date=YYYY-MM-DD */
 export type SiteEffectivePriceRowDto = {
   site_id: number