feat: add BELO peak hour analysis chart

- New backend endpoint GET /quotes/:type/peak-hours
- Groups daily price data by hour to find peak frequency
- Bar chart showing how often each hour is the daily peak
- Only displayed for BELO currency in analysis page

apps/frontend/src/lib/api.ts

@@ -45,6 +45,19 @@ export type HistoricalMinMax = {
   maxBuyDate: string | null;
 };
 
+export type PeakHour = {
+  hour: number;
+  frequency: number;
+  avgPeakBuy: number;
+  minPeakBuy: number;
+  maxPeakBuy: number;
+};
+
+export type PeakHoursResponse = {
+  totalDays: number;
+  peaks: PeakHour[];
+};
+
 async function fetcher<T>(url: string): Promise<T> {
   const res = await fetch(url, { credentials: "include" });
   if (!res.ok) {
@@ -109,6 +122,15 @@ export function getHistoricalMinMax(type: string): Promise<HistoricalMinMax> {
   return fetcher<HistoricalMinMax>(`/api/quotes/${type}/historical/min-max`);
 }
 
+export function getPeakHours(
+  type: string,
+  startDate: string,
+  endDate: string,
+): Promise<PeakHoursResponse> {
+  const params = new URLSearchParams({ startDate, endDate });
+  return fetcher<PeakHoursResponse>(`/api/quotes/${type}/peak-hours?${params}`);
+}
+
 export type MonthlyLast = {
   month: string;
   type: "BELO" | "BLUE" | "BNA";