Triage: mark confirmed-dead channels Invalid, clarify geo-blocked Japan feeds

Went through the open issue backlog and verified each claim against
the live streams with check_channels.py / curl before touching
anything, rather than acting on the reports alone.

Moved to Invalid (2 attempts, both `gone`, re-verified by hand):
- Greece: Start, Thraki Net TV
- Slovakia: Doma, Dajto, Krimi, Markíza TN Live, Jojko (joining the
  JOJ-family channels already Invalid - same upstream host, same
  missing-channel pattern)
- Bosnia and Herzegovina: Sevdah
- Spain: Nova, La 7 CYLTV, Canal TE24
- USA: NASA TV Public
- USA + zz_news_en: CNN / CNN International - both point at
  turnerlive.warnermediacdn.com/.../cnn_slate/..., which returns a
  permanently frozen manifest (#EXT-X-PUBLISHED-TIME and
  MEDIA-SEQUENCE identical across two fetches 8s apart, dated several
  months in the past) - a live-looking HTTP 200 that check_channels.py
  currently has no way to catch, since it never compares a URL against
  its own earlier response. Also moved the alternate CNN entry in
  zz_news_en.md (a raw.githubusercontent.com link that 404s outright).
- Not moved: N1 Bosna i Hercegovina (`disputed` - ffprobe found a real
  stream behind the dead-looking HTTP response, needs a human) and
  everything reported merely `unreachable`/`blocked` across these
  lists - neither is strong enough evidence on its own, see
  check_channels.py's own docstring.

Japan: added the Ⓖ marker to the 6 terrestrial channels on mov3.co
(NHK総合, 日本テレビ, テレビ朝日, TBSテレビ, テレビ東京, フジテレビ) -
confirmed HTTP 403 from here on all six, consistent with the
geo-restriction every other Ⓖ-marked channel in this repo already
documents. They were working `[>]` entries with no Ⓖ, which reads as
"this should work from anywhere" when it does not.

Left alone after checking (false alarms / already resolved, not a
list-file problem):
- Croatia HRT 1-4: already Ⓖ-marked and alive.
- Mongolia TenGer TV/TV5/TV9: all 40 Mongolia channels alive.
- Japan Willfonk/naori-test links: already Invalid on master.
- Several `unreachable` entries (Greece ART TV/Epirus TV 1, Croatia's
  RTL family, half of Spain, Bosnia's BHT/Glas Drine/etc.) -
  `unreachable` means "every attempt timed out or failed to connect
  from here", not "confirmed gone" - too weak to act on without a
  second opinion, and these didn't get one in this pass.

ran: python3 make_playlist.py (clean regen) + check_channels.py on
every touched list afterward to confirm nothing newly broke and the
moved channels no longer show up as working.

playlists/playlist_greece.m3u8

@@ -105,14 +105,10 @@ https://rtmp.win:3696/live/arttvgrlive.m3u8
 https://itv.streams.ovh:1936/corfuchannel/corfuchannel/playlist.m3u8
 #EXTINF:-1 tvg-name="Epirus TV 1" tvg-logo="https://i.imgur.com/QB3aSl1.png" tvg-id="epirustv1.gr" tvg-chno="94" tvg-country="GR" group-title="Greece",Epirus TV 1
 https://rtmp.win:3929/live/epiruslive.m3u8
-#EXTINF:-1 tvg-name="Start" tvg-logo="https://i.imgur.com/nrEtmBN.png" tvg-id="starttv.gr" tvg-chno="95" tvg-country="GR" group-title="Greece",Start
-https://live.cast-control.eu/StartMedia/StartMedia/playlist.m3u8
 #EXTINF:-1 tvg-name="Center TV" tvg-logo="https://i.imgur.com/52JW71Q.png" tvg-id="CenterTV.gr" tvg-chno="101" tvg-country="GR" group-title="Greece",Center TV
 https://eu1.streams.gr:8081/centertv/index.m3u8
 #EXTINF:-1 tvg-name="Delta Evros" tvg-logo="https://i.imgur.com/PDfSkRF.png" tvg-id="DeltaTV.gr" tvg-chno="102" tvg-country="GR" group-title="Greece",Delta Evros
 http://81.171.10.42:1935/liveD/DStream.sdp/chunklist_w819085920.m3u8
-#EXTINF:-1 tvg-name="Thraki Net TV" tvg-logo="https://i.imgur.com/DV0I0ed.png" tvg-id="ThrakiNetTV.gr" tvg-chno="103" tvg-country="GR" group-title="Greece",Thraki Net TV
-https://cdn.onestreaming.com/thrakinettv/thrakinettv/playlist.m3u8
 #EXTINF:-1 tvg-name="Creta" tvg-logo="https://i.imgur.com/x0qK8IE.png" tvg-id="CretaTV.gr" tvg-chno="111" tvg-country="GR" group-title="Greece",Creta
 http://live.streams.ovh:1935/tvcreta/tvcreta/playlist.m3u8
 #EXTINF:-1 tvg-name="Kriti 1" tvg-logo="https://i.imgur.com/C1ucQeC.png" tvg-id="Kriti1Tv.gr" tvg-chno="112" tvg-country="GR" group-title="Greece",Kriti 1