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.

lists/bosnia_and_herzegovina.md

@@ -11,7 +11,7 @@
 | 5   | RTV HB Ⓢ | [>](https://prd-hometv-live-open.spectar.tv/ERO_1_083/playlist.m3u8) | <img height="20" src="https://upload.wikimedia.org/wikipedia/en/6/60/Logo_of_TV_Herceg-Bosne.png"/> | RTVHB.ba |
 | 6   | RTV BN | [>](https://stream2.rtvbn.tv:8080/live_1935/bnstream/index.m3u8) | <img height="20" src="https://i.imgur.com/DUBvfWb.png"/> | BNTV.ba |
 | 7   | RTV Glas Drine | [>](http://glasdrine.cutuk.net:8081/433ssdsw/GlasDrineSD/playlist.m3u8) | <img height="20" src="https://i.imgur.com/9NgxOdb.png"/> | RTVGlasDrine.ba |
-| 8   | Sevdah Ⓢ | [>](https://restreamer2.tnt.ba/hls/stream.m3u8) | <img height="20" src="https://i.imgur.com/V6W3yEp.png"/> | SevdahTV.ba |
+| 8   | Sevdah Ⓢ | [x](https://restreamer2.tnt.ba/hls/stream.m3u8) | <img height="20" src="https://i.imgur.com/V6W3yEp.png"/> | SevdahTV.ba |
 | 9   | TNT Kids | [>](https://restreamer1.tnt.ba/hls/tntkids.m3u8) | <img height="20" src="https://i.imgur.com/irTDbpn.png"/> | TNTKidsTV.ba |
 | 10  | Televizija 5 | [>](https://balkanmedia.dynu.net/hls/tv5web.m3u8) | <img height="20" src="https://i.imgur.com/znpvJys.png"/> | Televizija5.ba |
 | 11  | Kanal 6 | [>](https://restreamer1.tnt.ba/hls/kanal6.m3u8) | <img height="20" src="https://i.imgur.com/GGhvR0l.png"/> | Kanal6.ba |