feat: večeře (extra meal slot)

- Nová stránka /vecere pro evidenci extra jídla (večeře/pozdní oběd)
- MealSlot enum (obed/extra), oddělený storage namespace YYYY-MM-DD_extra
- slot parametr na všech food endpointech a GET /api/data
- Push reminder: přechod na 60min cooldown, login v payloadu místo endpointu
- server: slot?: string → slot?: MealSlot, enum konstanty místo literálů
- Jest testy izolace extra/obed storage namespace
- Aktualizace changelogů (saláty, SINGLE_PAYMENT, večeře)

server/src/tests/service.slot.test.ts

@@ -0,0 +1,60 @@
+const mockStorageData = new Map<string, any>();
+jest.mock('../storage', () => ({
+    __esModule: true,
+    default: () => ({
+        hasData: async (key: string) => mockStorageData.has(key),
+        getData: async <T>(key: string) => mockStorageData.get(key) as T,
+        setData: async <T>(key: string, val: T) => void mockStorageData.set(key, val),
+    }),
+    storageReady: Promise.resolve(),
+}));
+
+import { addChoice, getData } from '../service';
+import { LunchChoice, MealSlot } from '../../../types/gen/types.gen';
+
+const TODAY = new Date('2025-01-10');
+const TODAY_STR = '2025-01-10';
+const TODAY_EXTRA_STR = '2025-01-10_extra';
+
+describe('MealSlot storage isolation', () => {
+    beforeEach(() => {
+        mockStorageData.clear();
+        jest.useFakeTimers();
+        jest.setSystemTime(TODAY);
+    });
+
+    afterEach(() => {
+        jest.useRealTimers();
+    });
+
+    test('addChoice slot=extra writes only to _extra key, not to obed key, and returns slot=EXTRA', async () => {
+        const result = await addChoice('user1', false, LunchChoice.OBJEDNAVAM, undefined, TODAY, MealSlot.EXTRA);
+        expect(result.slot).toBe(MealSlot.EXTRA);
+        expect(mockStorageData.has(TODAY_EXTRA_STR)).toBe(true);
+        expect(mockStorageData.has(TODAY_STR)).toBe(false);
+        const extraData = mockStorageData.get(TODAY_EXTRA_STR);
+        expect(extraData.choices.OBJEDNAVAM?.['user1']).toBeDefined();
+    });
+
+    test('getData slot=extra returns slot===MealSlot.EXTRA and no menus', async () => {
+        await addChoice('user1', false, LunchChoice.OBJEDNAVAM, undefined, TODAY, MealSlot.EXTRA);
+        const result = await getData(TODAY, MealSlot.EXTRA);
+        expect(result.slot).toBe(MealSlot.EXTRA);
+        expect(result.menus).toBeUndefined();
+    });
+
+    test('addChoice slot=extra does not modify obed data even when obed has PIZZA choice', async () => {
+        mockStorageData.set(TODAY_STR, {
+            choices: { PIZZA: { user1: { selectedFoods: [0], trusted: false } } },
+            todayDayIndex: 4,
+            date: '10. 1. 2025',
+            isWeekend: false,
+            dayIndex: 4,
+        });
+
+        await addChoice('user1', false, LunchChoice.OBJEDNAVAM, undefined, TODAY, MealSlot.EXTRA);
+
+        const obed = mockStorageData.get(TODAY_STR);
+        expect(obed.choices.PIZZA?.['user1']).toBeDefined();
+    });
+});