JP IPTV Clean 2.3.1

Playlist: https://jp-iptv-clean-v231.pages.dev/JP.m3u
Status:   https://jp-iptv-clean-v231.pages.dev/status.json
Refresh:  https://jp-iptv-clean-v231.pages.dev/refresh

V2.3.1:
- multi-source public Japan/Japanese discovery
- country + language + Free-TV + community discovery
- Japan relevance gate for global feeds; foreign/geo-blocked noise rejected
- strict URL/ID duplicate suppression
- multi-candidate fallback per channel
- core 6 terrestrial priority checks
- rotating health checks within Cloudflare Free limits
- up to 100 active channels in the output
- discovery pool ceiling raised to 320 candidates
- deep HLS segment verification on scanned channels
- persistent rotating cursor across refresh cycles
- healthy channels are carried forward between rounds
- a channel is dropped only after 3 consecutive failed checks
- known mojibake names are repaired
- no login/DRM/token bypass