FreeFlix CLI v1.6.4

⚡ Instant startup (fix)

• freeflix showed nothing for ~2.5 s on launch. Cause: four remote config
  files were fetched synchronously at import time (players/new_url/kakaflix
  overrides + source portals), blocking before anything could display.
• These are optional upstream overrides of bundled defaults, so we now apply
  the defaults instantly and pull the remote overrides in a background
  thread kicked off at launch. They merge in (in place) well before any
  playback needs them. Import time dropped from ~3.8 s to ~0.6 s.
• Trimmed the splash sequence a touch too.