fix: resolve 6 Gitea issues (#9, #10, #12, #14, #15, #21)

- #21: Add missing await in removeChoiceIfPresent() to prevent user appearing in two restaurants
- #15: Add 1-hour TTL for menu refetching to avoid scraping on every page load
- #9: Block stats API and UI navigation for future dates
- #14: Add restaurant warnings (missing soup/prices, stale data) with warning icon
- #12: Pre-fill restaurant/departure dropdowns from existing choices on page refresh
- #10: Add voting statistics endpoint and table on stats page

server/src/stats.ts

@@ -25,6 +25,12 @@ export async function getStats(startDate: string, endDate: string): Promise<Week
         throw Error('Neplatný rozsah');
     }
 
+    const today = new Date();
+    today.setHours(23, 59, 59, 999);
+    if (end > today) {
+        throw Error('Nelze načíst statistiky pro budoucí datum');
+    }
+
     const result = [];
     for (const date = start; date <= end; date.setDate(date.getDate() + 1)) {
         const locationsStats: DailyStats = {