Add course schedules for ISF and ITZS programs for 2026 and 2024 sessions

- Created new snapshot files for ISF credits and daily schedules for the 26-АРХ and 26-ПГС programs.
- Added summer 2026 and winter 2024 exam schedules for the 23-ИТзс program, detailing lectures, labs, and consultations.

test/weeks.test.js

@@ -63,6 +63,8 @@ test("Пометки недель: диапазоны, «с N», опечатк
     [6, 11],
   ]);
   assert.deepEqual(parseWeekRanges("со 2 нед."), [[2, null]]);
+  assert.deepEqual(parseWeekRanges("1-4н.;6-12н."), [[1, 4], [6, 12]]);
+  assert.deepEqual(parseWeekRanges("1-6н , 13-18н"), [[1, 6], [13, 18]]);
   assert.deepEqual(parseWeekRanges("с 4-16н"), [[4, 16]]);
   assert.deepEqual(parseWeekRanges("1-8,10-17"), [
     [1, 8],