Add tvkaista.org

[freearhey]

Closes #2704

npm test --- tvkaista.org           

> test
> run-script-os tvkaista.org


> test:default
> TZ=Pacific/Nauru npx jest --runInBand tvkaista.org

 PASS  sites/tvkaista.org/tvkaista.org.test.js
  ✓ can generate valid url (6 ms)
  ✓ can parse response for today (200 ms)
  ✓ can parse response for next day (118 ms)
  ✓ can handle empty guide (7 ms)

Test Suites: 1 passed, 1 total
Tests:       4 passed, 4 total
Snapshots:   0 total
Time:        1.288 s
Ran all test suites matching /tvkaista.org/i.

npm run grab --- --site=tvkaista.org

> grab
> npx tsx scripts/commands/epg/grab.ts --site=tvkaista.org

starting...
config:
  output: guide.xml
  maxConnections: 1
  gzip: false
  site: tvkaista.org
loading channels...
  found 149 channel(s)
run #1:
  [1/298] tvkaista.org (fi) - 3sat - Mar 1, 2025 (0 programs)
    ERR: Request failed with status code 404
  [2/298] tvkaista.org (fi) - 3sat - Mar 2, 2025 (0 programs)
    ERR: Request failed with status code 404
  [3/298] tvkaista.org (fi) - zdf - Mar 2, 2025 (0 programs)
    ERR: Request failed with status code 404
  [4/298] tvkaista.org (fi) - zdf - Mar 1, 2025 (0 programs)
    ERR: Request failed with status code 404
  [5/298] tvkaista.org (fi) - yle-tv2 - Mar 2, 2025 (52 programs)
  [6/298] tvkaista.org (fi) - yle-tv2 - Mar 1, 2025 (59 programs)
  [7/298] tvkaista.org (fi) - yle-tv1 - Mar 2, 2025 (34 programs)
  [8/298] tvkaista.org (fi) - yle-tv1 - Mar 1, 2025 (45 programs)
  [9/298] tvkaista.org (fi) - yle-teema-fem - Mar 2, 2025 (31 programs)
  ...
  [298/298] tvkaista.org (fi) - 24-horas - Mar 1, 2025 (51 programs)
  saving to "guide.xml"...
  done in 00h 00m 29s