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/voting.ts

@@ -1,10 +1,14 @@
-import { FeatureRequest } from "../../types/gen/types.gen";
+import { FeatureRequest, VotingStats } from "../../types/gen/types.gen";
 import getStorage from "./storage";
 
 interface VotingData {
     [login: string]: FeatureRequest[],
 }
 
+export interface VotingStatsResult {
+    [feature: string]: number;
+}
+
 const storage = getStorage();
 const STORAGE_KEY = 'voting';
 
@@ -51,4 +55,22 @@ export async function updateFeatureVote(login: string, option: FeatureRequest, a
     }
     await storage.setData(STORAGE_KEY, data);
     return data;
+}
+
+/**
+ * Vrátí agregované statistiky hlasování - počet hlasů pro každou funkci.
+ *
+ * @returns objekt, kde klíčem je název funkce a hodnotou počet hlasů
+ */
+export async function getVotingStats(): Promise<VotingStatsResult> {
+    const data = await storage.getData<VotingData>(STORAGE_KEY);
+    const stats: VotingStatsResult = {};
+    if (data) {
+        for (const votes of Object.values(data)) {
+            for (const feature of votes) {
+                stats[feature] = (stats[feature] || 0) + 1;
+            }
+        }
+    }
+    return stats;
 }